Quiz 13. Light

1. A ray of light travels in a
a. circle.
b. straight-line.
c. right-angle.
d. none of the above.

2. Visible electromagnetic radiation is called
a. light.
b. a ray.
c. a Light Emitting Diode.
d. none of the above.

3. The rate at which light falls on a surface is called
a. luminance.
b. luminous flux.
c. capacitance.
d. none of the above.

4. The speed of light in a special type of a precious gem is 1.5×10⁸m/s. What is this gem's index of refraction?
a. 0.5
b. 1.5
c. 2
d. 2.5

5. A ray of light hits a plane mirror 35° from the normal. What is the angle of reflection?
a. 35°
b. 45°
c. 55°
d. 90°

6. The bending of light as it travels from one medium to another is called
a. reflection.
b. refraction.
c. inspection.
d. none of the above.

7. Which type of electromagnetic radiation has the highest frequencies?
a. Light
b. X-ray
c. Ultra-violet
d. Infra-red

8. The relationship between illumination and distance is
a. inverse.
b. inverse squared.
c. direct.
d. none of the above.

9. What is the approximate speed of light?
a. 300 m/s
b. 3,000 km/s
c. 300,000 km/s
d. 3,000,000 km/s

10. Plastic has an index of refraction of 1.46. If a ray of light hits a sheet of plastic at an angle of 27.3°, what will the angle of refraction be?
a. 18.3°
b. 21.9°
c. 34.5°
d. None of the above