General Physics 102 lab
sawyer2016
optics.zipoptics/ABline.class
synchronized class ABline { static double eps; static double PI2; int xa; int ya; int xb; int yb; double ca; double cb; double m; double b; double index; double x; double y; double len; double cta; double alpha; double r12p; double r12s; boolean total; double rc; double twoPI; void draw(java.awt.Graphics); void translate(int, int); void setPoints(int, int, int, int); double angle(double, double, double, double); boolean touch(ray); ray reflection(ray); ray refraction(ray); void ABline(double); static void <clinit>(); }
optics/box.class
public synchronized class box extends java.applet.Applet { double time; java.awt.Dimension area; java.awt.Image bgImage; java.awt.Image fgImage; java.awt.Graphics gb; java.awt.Graphics g; java.awt.Color bgColor; String rts; String[] STR; int xx; int yy; boolean rightClick; int size; int size2; int size4; int dragLight; boolean changed; int xs; int ys; java.awt.FontMetrics fm; int chy; int tx; int ty; int[] b; int xc; boolean display; java.awt.Point[] light; double len; double index; java.awt.Polygon hp; java.awt.Polygon tp; double PI6; double LEN; boolean showC; public void init(); String d2String(double); public boolean mouseDown(java.awt.Event, int, int); public boolean mouseDrag(java.awt.Event, int, int); public boolean mouseUp(java.awt.Event, int, int); public boolean mouseMove(java.awt.Event, int, int); void clear(boolean); public void paint(java.awt.Graphics); void drawPointer(java.awt.Point, java.awt.Point); public void update(java.awt.Graphics); void drawRay(double, double, double); public void box(); }
optics/c1.gif
optics/c2.gif
optics/er.gif
optics/esp.gif
optics/eye.gif
optics/eyescan.gif
optics/fiber.class
public synchronized class fiber extends java.applet.Applet { double time; java.awt.Dimension area; java.awt.Image bgImage; java.awt.Image fgImage; java.awt.Graphics gb; java.awt.Graphics g; java.awt.Color bgColor; String rts; String[] STR; java.awt.TextField tf; int xs; int ys; boolean rightClick; boolean draghead; boolean dragtail; java.awt.FontMetrics fm; int chy; int x1; int y1; int y2; int xx; int yy; int dd; java.awt.Point head; java.awt.Point tail; double m; double b; double x; double y; double sc2; double tc2; double n; java.awt.Polygon hp; java.awt.Polygon tp; double PI6; double LEN; double cta; public void init(); public boolean action(java.awt.Event, Object); String d2String(double); public boolean mouseDown(java.awt.Event, int, int); public boolean mouseDrag(java.awt.Event, int, int); public boolean mouseUp(java.awt.Event, int, int); void clear(); public void paint(java.awt.Graphics); public void update(java.awt.Graphics); double drawIt(double, double, double); void drawPointer(java.awt.Point, java.awt.Point); public void fiber(); }
optics/fish.swf
optics/i.gif
optics/ie.gif
optics/image.class
public synchronized class image extends java.applet.Applet implements Runnable { java.awt.Dimension area; java.awt.Image bgImage; java.awt.Image fgImage; java.awt.Graphics gb; java.awt.Graphics g; java.awt.Color bgColor; String rts; String[] STR; int xx; int yy; int xs2; int ys2; boolean running; Thread animThread; long startTime; long lastTime; long delay; long delta; double c; int cnt; int ns; double xt; double yt; double bt; boolean rightClick; boolean dragm; boolean dragd; boolean dragd2; boolean down; int xs; int ys; double cta1; double cta2; double ctaa; double dd; double PI2; double m; int ni; int nf; int n; double V; double dc2; java.awt.FontMetrics fm; int chy; int xc; int yc; int size; int size2; int xm; int ym; int ym2; int Nmax; int NR; int Nmax1; double cta; double rm; double dc; double[] CR; double[] X; double[] Y; double[] VX; double[] VY; double cst; int NI; double[] PXA; double[] PYA; double[] PXB; double[] PYB; java.awt.Point na; java.awt.Point nb; public void init(); public void reset(); public void start(); public void stop(); public void run(); void advanced(double); public boolean mouseDown(java.awt.Event, int, int); public boolean mouseDrag(java.awt.Event, int, int); void setupRay(); public boolean mouseUp(java.awt.Event, int, int); void clear(); public void paint(java.awt.Graphics); void imgs(double, double, double[], double[], java.awt.Point); public void update(java.awt.Graphics); public void image(); }
optics/image_e.html
![]()
Multiple
Reflection from two plane mirrors
Rays of lights are reflected from the mirror, each ray satisfying the
law of reflection.
It is fun to play with two plane mirrors, multiple images are
formed.
Would you like to try it with this java applet?
The inverted moving fish (virtual image) is what the observer (fish on the left) will see underwater.
When the moving fish is away from the observer, light emitter from the moving fish will be totally reflected at the water-air interface. So the water-air interface acting like a mirror. When the distance is too short for the total internal reflection to occurs, the virtual image above the water vanished.
You can click and drag the observer left/right to change its location. More information will be shown when you drag the observer (fish).
Why does a fish appear to be closer to the surface of water than it really is?[removed] [removed]The following java applet let you find out the answer, and learn the physics of refraction, and total internal reflection.
Usage:
A scanning eye represent the observer. You can click on it and drag it to any position you like. The whole screen will be clear when you drag the scanning eye.to java applet This is an imageYou can draw any pattern you like, and the java program will draw the virtual image of it. ( If the virtual can be formed due to refraction or total internal reflection)
When you draw in the water region, the region where the total internal reflection is possible, will be shown.
If you click the right mouse button, it will show you many light rays emitted. (including refraction rays and total internal reflection rays)
Right click the mouse button twice is another way to clear the screen.
Your suggestions are highly appreciated! Please click [email protected]You can draw any thing within the animation region, for example: the object shown in the above image.Light emitted from the object is refracted at the water and air interface. The observer trace back those refracted light to find the image of the object.
The image appear closer to the water surface and its shape is different from the object.
How to determine the location of the image (yellow dot) ?
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The world viewed under water is different from what we view it above the water surface.
Drag the observer (eye) under the water and find out more interesting phenomena.
Author¡G
Fu-Kwun Hwang,
Dept. of physics,
National Taiwan Normal University
Last modified :
More
physics related java applets
optics/point.class
synchronized class point { static java.awt.Graphics gb; static java.awt.Rectangle r; static double n; static int cnt; double x; double y; double vx; double vy; double v; double c; int status; void set(double, double, double, double); static void init(java.awt.Graphics, java.awt.Rectangle, double); point advanced(double); void point(double, double, double, double); }
optics/prism.class
public class prism extends java.applet.Applet { double time; java.awt.Dimension area; java.awt.Image bgImage; java.awt.Image fgImage; java.awt.Graphics gb; java.awt.Graphics g; java.awt.Color bgColor; int xx; int yy; boolean rightClick; boolean movep; boolean dragt; boolean dragh; boolean dragp; int xs; int ys; boolean check; double[] C; double PI2; java.awt.FontMetrics fm; prisms p; int chy; int xa; java.awt.Rectangle box; java.awt.Point head; java.awt.Point tail; int N; int n; int N2; double V; ray light; double I; int size; int size2; double dist; double angle; java.awt.Polygon hp; java.awt.Polygon tp; double PI6; double cta; double ctaa; double c2a; double LEN; double maxI; int maxCnt; int Cnt; ABline AB; public void init(); public void reset(); String d2String(double); public boolean mouseDown(java.awt.Event, int, int); public boolean mouseDrag(java.awt.Event, int, int); public boolean mouseUp(java.awt.Event, int, int); public void changeIndex(double); void clear(); public void paint(java.awt.Graphics); public void update(java.awt.Graphics); void drawPointer(java.awt.Point, java.awt.Point); ray drawRay(ray); void drawTo(ray); ABline getTouch(ray); public void prism(); }
optics/prisms.class
class prisms { int N; int N1; java.awt.Polygon P; int xc; int yc; double[] L; double[] C; double PI2; ABline[] AB; java.awt.Rectangle r; int size; int size2; double ax; double ay; double bx; double by; double ac; double dv; double c2a; int dragID; void prisms(int, int, double, double); void setXY(); void setLine(int); void drawPrism(java.awt.Graphics, java.awt.Color); void drawAngles(java.awt.Graphics, int, int); double angleAB(int, int, int); void fillPrism(java.awt.Graphics, java.awt.Color); void translate(int, int); boolean checkDrag(int, int); void drag(int, int); }
optics/prism_e.html
Prism: Reflection and refraction
This java applet let you play with a light source and a prism, to study the physics of light. There are reflection and refraction occurs at the interface between two media. (Total internal reflection might also occurs) [removed] [removed] [removed] refractive indices: air (n1)= prism(n2)= Do not forget to hit ENTER keyUsage:
Click the red region to change the light direction. Click other region of light source can move the light pen to differ location( even inside the prism).Things to watch:Click one of the corner of the prism to change the shape of prism. Click inside the prism to change its location.
When tracing of the light will terminated when the ray intensity is less than than 0.4%. The relative intensity for each ray is shown at the boundary. Intensity of red and green are used to represent two different polarization. The yellow light (sum of red light and green light) represent equal intensity of two polarization waves.
At Brewster's angle, only one of the polarized light is refracted, and other one is totally reflected. The index of refraction for the prism is 1.5
1. Total internal reflection 2. Change in light intensity 3. There might be small bugs, did you find out?
Light will travel with different speed at different media, which cause the reflection and refraction.to java applet Your suggestions are highly appreciated! Please click [email protected]For reflection: the angle of incidence is equal to angle of reflection. For refraction: the Snell's law govern the angle
index of refraction for media 1:Part of the energy is reflected and the rest propagate into new media. The ratio depend on incident angle and index of refraction ( refracted angle ) EM (transverse) wave can have two polarization (perpendicular to each other and )angle of incidence
index of refraction for media 2:
angle of refraction
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The intensity
is proportional to
The intensity of electric field changed when reflection/refraction occurs,
![]()
where
,
So the intensity for the reflected light
is proportional to
Since the energy is conserved, so we can find out the intensity of refraction light.![]()
For normal incident, both
and
equal to zero. The coefficient are the same =
For light emit from air (n=1.) into glass (n=1.5) The electric field scale to = (1.5-1)/(1.5+1)=0.2 So the intensity of the reflection scale to 0.22=0.04 ( 4% of incident light) So 96% light will enter the glass and only 4% of light were reflected.
This java applet use above equations to calculate the relative intensity of each ray.
Author：
Fu-Kwun Hwang,
Dept. of physics,
National Taiwan Normal University
Last modified :
More
physics related java applets
optics/r12p.gif
optics/r12s.gif
optics/ray.class
synchronized class ray { double x; double y; double cta; double r; double p; boolean fromAir; double eps; java.awt.Color color(float); void setAngle(int, int, int, int); void setXY(int, int); double intensity(); void ray(int, int); void ray(); void ray(double, double, double, double, double, boolean); }
optics/refraction.class
public synchronized class refraction extends java.applet.Applet implements Runnable { int yOffset; double time; java.awt.Dimension area; java.awt.Image bgImage; java.awt.Image fgImage; java.awt.Graphics gb; java.awt.Graphics g; java.awt.Color bgColor; String rts; String[] STR; int xx; int yy; boolean running; Thread animThread; long startTime; long lastTime; long delay; long delta; point p; boolean rightClick; java.awt.FontMetrics fm; int chy; int tx; int ty; int yc; int xp; int yp; int N; int ray2cnt; double n; point[] ray; point[] ray2; java.awt.Rectangle r; double vw; int size; int size2; public void init(); public boolean action(java.awt.Event, Object); public void reset(); String d2String(double); public void start(); public void stop(); public void run(); void advanced(double); public boolean mouseDown(java.awt.Event, int, int); public boolean mouseDrag(java.awt.Event, int, int); public boolean mouseUp(java.awt.Event, int, int); void clear(); public void paint(java.awt.Graphics); public void update(java.awt.Graphics); public void refraction(); }
optics/shadow.class
public synchronized class shadow extends java.applet.Applet implements Runnable { double time; java.awt.Dimension area; java.awt.Image bgImage; java.awt.Image fgImage; java.awt.Graphics gb; java.awt.Graphics g; java.awt.Color bgColor; String rts; String[] STR; int xx; int yy; boolean running; Thread animThread; long startTime; long lastTime; long delay; long delta; boolean rightClick; boolean dragr; java.awt.FontMetrics fm; int chy; int tx; int ty; int x0; int y0; int size; int size2; int xc; java.awt.Rectangle r; java.awt.Rectangle s; double m; double b; double x1; double x2; double y1; double y2; public void init(); public boolean action(java.awt.Event, Object); public void reset(); String d2String(double); public void start(); public void stop(); public void run(); void advanced(double); public boolean mouseDown(java.awt.Event, int, int); public boolean mouseDrag(java.awt.Event, int, int); public boolean mouseUp(java.awt.Event, int, int); void clear(); public void paint(java.awt.Graphics); public void update(java.awt.Graphics); public void shadow(); }
optics/shadow.html
標題
起頭
[removed] [removed] [removed]
使用說明：
物理解說：
to java applet 歡迎批評指教！ 電子郵件 ： 請按 [email protected] 作者： 國立台灣師範大學 物理系 黃福坤 最後修訂時間：
