Physics 114 –Summer 2007

Participation Points #5

To be turned in at the end each discussion session, stapled on top of #4, #3, #2 & #1

The complete set must be turned in on or before Exam 3 to receive credits.

Student’s Name:____________________ Team #________

1.- (a) White light goes from air through a glass slab with parallel surfaces. Will its colors be dispersed when it emerges from the glass? Explain.

(b) You send white light through two identical glass prisms oriented as shown. Trace the light rays and describe the outgoing ray

2.- For the air-medium (index of refraction n) interface, show that the critical angle and the polarizing angle are related by

3.- A light ray is propagating in a crystal where its wavelength is 540 nm. It strikes the interior surface of the crystal with an incidence angle of 34⁰ and emerges into the surrounding air at 76⁰ to the surface normal. (a) Find the light frequency

(b) Find its wavelength in air.

4. If you place a screen at the location of a virtual image, would you see the image on the screen? Why or why not?

5.- By holding a magnifying glass 25 cm from my desk lamp, I find I can focus an image of the lamp’s bulb on a wall 1.6 m from the lamp. What is the focal length of my magnifying glass?

6.- A double convex lens has equal curvature radii of 35 cm. An object placed 30 cm from the lens forms a real image at 128 cm. What is the refractive index of the lens?

7.- (a) You can hear sound around the corners but you can’t see around the corners. Why is the difference?

(b) Describe the change in the diffraction pattern of a single slit as the slit is narrowed.

8. Green light at 520 nm is diffracted by a grating with 3000 lines per cm. Through what angle is the light diffracted in (a) first and

(b) fifth order?

9.- Find the minimum thickness of a soap film n=1.33 in which 550-nm light will undergo constructive interference.