Need Physics help (light)

Live forum: http://forum.freeipodguide.com/viewtopic.php?t=38647

CoMpFrEaK

04-05-2006 08:54:26

Here are the questions i need help on.

When a ray of light enters on medium from another medium which of the following never changes?

1. speed
2 direction
3. wave length
4. frequency
5. they all change

An object is placed at the focal point of a thin diverging lens of focal length f. What is the image distance

1. F
2. 2F
3. 1/F
4. F/2
5. Infinate

Light appears to behave as a particle, as evidenced by _____. And as a wave as evidenced by ______.

1. refraction, reflection
2. polarization, reflection
3. reflection, polarization
4. polarization, refraction
5. all of the above are true

Total internal reflection can occur when light is trying to pas from one medium into another medium ___.

1. with a lower index of refraction
2. with a higher index of refraction
3. at less than the critical angle
4. with the same index of refraction
5. any of the above

If the object distance from a convergin thin lens is more then twice the focal length of the lens, the image is

1. virtual and erect
2. larger than the object
3. located inside the focal point
4. located at a distance between f and 2f from the lens
5. located at a distance more then 2f from the lens

The wavelength of yellow sodium light in a vacuum is 5.89x10^-7 meter. the speed of this light in glass with an index of refraction of 1.5 is most nearly?

1. 4x10^-7 m/s
2. 9x10^-7 m/s
3. 2x10^8 m/s
4. 3x10^8 m/s
5. 4.5x10^8 m/s

Any help woud be appericated!