1. Select the correct statement:
A.ultraviolet light has a longer wavelength than infrared
B.blue light has a higher frequency than x rays
C.radio waves have higher frequency than gamma rays
D.gamma rays have higher frequency than infra-red waves
E.electrons are a type of electromagnetic wave

2. Which of the following is NOT true for electromagnetic waves?
A.they consist of changing electric and magnetic fields
B.they travel at different speeds in vacuum, depending on their frequency
C.they transport energy
D.they transport momentum
E.they can be reflected


The diagram shows the passage of a ray of light from air into a substance X. The index of refraction of X is:



If nwater = 1.33, what is the angle of refraction for the ray shown?


5. The critical angle for total internal reflection at a diamond-air interface is 25°. Suppose light is incident at an angle of q with the normal. Total internal reflection will occur if the incident medium is:
A.air and q = 25°
B.air and q > 25°
C.air and q < 25°
D.diamond and q < 25°
E.diamond and q > 25°

6. When you stand in front of a plane mirror, your image is:
A.real, erect, and smaller than you
B.real, erect, and the same size as you
C.virtual, erect, and smaller than you
D.virtual, erect, and the same size as you
E.real, inverted, and the same size as you

7. Where must an object be placed in front of a concave mirror so that the image and object are the same size? (F is the focal point and C is the center of curvature.)
A.at F
B.at C
C.between F and the mirror
D.between F and C
E.beyond C

8. A concave mirror forms a real image which is twice the size of the object. If the object is 20 cm from the mirror, the radius of curvature of the mirror must be about:
A.13 cm
B.20 cm
C.27 cm
D.40 cm
E.80 cm

9. A convex spherical mirror has a focal length of 12 cm. If an object is placed 6 cm in front of it the image position is:
A.4 cm behind the mirror
B.4 cm in front of the mirror
C.12 cm behind the mirror
D.12 cm in front of the mirror
E.at infinity

10. A concave refracting surface is one with a center of curvature:
A.to the left of the surface
B.to the right of the surface
C.on the side of the incident light
D.on the side of the refracted light
E.on the side with the higher index of refraction

11. Where must an object be placed in front of a converging lens in order to obtain a virtual image?
A.At the focal point
B.At twice the focal length
C.Greater than the focal length
D.Between the focal point and the lens
E.Between the focal length and twice the focal length

12. Radio waves differ from visible light waves in that radio waves:
A.travel slower
B.have a higher frequency
C.travel faster
D.have a lower frequency
E.require a material medium

13. Polarization experiments provide evidence that light is:
A.a longitudinal wave
B.a stream of particles
C.a transverse wave
D.some type of wave
E.nearly monochromatic

14. Light from any ordinary source (such as a flame) is usually:
B.plane polarized
C.circularly polarized
D.elliptically polarized


The diagrams show four pairs of polarizing sheets, with the polarizing directions indicated by dashed lines. The two sheets of each pair are placed one behind the other and the front sheet is illuminated by unpolarized light. The incident intensity is the same for all pairs of sheets. Rank the pairs according to the intensity of transmitted light, least to greatest.

A.1, 2, 3, 4
B.4, 2, 1, 3
C.2, 4, 3, 1
D.2, 4, 1, 3
E.3, 1, 4, 2

16. A clear sheet of polaroid is placed on top of a similar sheet so that their polarizing axes make an angle of 30° with each other. The ratio of the intensity of emerging light to incident unpolarized light is:

17. Three polarizing sheets are placed in a stack with the polarizing directions of the first and third perpendicular to each other. What angle should the polarizing direction of the middle sheet make with the polarizing direction of the first sheet to obtain zero transmitted intensity when unpolarized light is incident on the stack?
E.all angles allow light to pass through

This is the end of the test. When you have completed all the questions and reviewed your answers, press the button below to grade the test.