Below you will find a set of 5 conceptual and numerical revision questions selected randomly from lots of questions I have put together covering the material in Chapter 31, "Properties of Light". This includes questions on energy, reflection, refarction and polarization. When you have finished the quiz, click on the "Submit Quiz" button at the bottom and within seconds it will be automatically graded and the results returned to you!

To select a new set of questions click on the "Reload" or "Refresh" button on your browser. You may find some of the questions duplicated but that's the nature of a random selection. Try it a few times ... it's not fattening and you may learn something!

Many thanks to Mark Wood for producing the quiz-maker code.

Q1: A ray of light traveling in air enters the end of a rectangular block of a material that has an idex of refraction n = 1.35.

The largest value of the incident angle for which total internal reflection occurs at the upper surface of the material is approximately

75°
48°
56°
78°
None of these is correct

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Q2: Light with a wavelength of 589 nm in a vacuum strikes the surface of an unknown liquid at an angle of 31.2° with respect to the normal to the surface. If the light travels at a speed of 1.97 × 10⁸ m/s through the liquid, what is the angle of refraction?

19.9°
26.1°
34.2°
39.3°
51.9°

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Q3: A ray of light originates in medium A and is incident upon medium B. For which one of the following pairs of indices of refraction for A and B is total internal reflection not possible?

n_A = 1.36: n_B = 1.00
n_A = 1.26: n_B = 1.15
n_A = 2.54: n_B = 1.63
n_A = 1.28: n_B = 1.36
n_A = 1.12: n_B = 1.06

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Q4: A child is looking at a reflection of the sun in a pool of water. When she puts on a pair of Polaroid sunglasses with a vertical transmission axis, she can no longer see the reflection. At what angle is she looking at the pool of water?

45.0°
48.8°
53.1°
61.6°
77.3°

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Q5: What is the Brewster angle if light is reflected from a plastic plate (n = 1.575) submerged in ethyl alcohol (n = 1.362)?

68.3°
40.8°
59.8°
30.1°
49.1°

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