Name:_______________________

Quiz 8

04/20/2006

Ch. 25-26

Useful number(s): speed of light c=3x10⁸ m/s

1) A laser beam in air hits a flat piece of glass (n=1.5) at an angle of 15 deg to the normal. The refracted beam continues through the glass and enters water (n=1.3). What is the exiting angle into the water?

2) A 160cm man stands 2m away from a lens with a focal length of 500mm. His feet are on the principle axis.

a) Draw a diagram including at least 2 rays that begin at the man’s head and end on the head of the image.

b) Is the lens converging or diverging?

c) How far is the image from the lens? Is it real or virtual? Is it upright or inverted? How tall is the image?