optics 2 questions

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Last updated 8:59 PM on 10/10/26
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14 Terms

1
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A ray hits an interface perpendicularly.  The angle of incidence is ...

Correct answer:

0°

90°

45°

180°

0°

2
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A ray hits an interface perpendicularly.  The angle of reflection is ...

Correct answer:

0°

90°

45°

180°

0°

3
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Light refracts from water (n1 = 1.33) into air (n2 = 1.0) with an angle of incidence (ϑi) of 30°.  What follows?

refraction into air with an angle of refraction of about 20°

refraction into air with an angle of refraction of about 30°

refraction into air with an angle of refraction of about 40°

no refraction but only total internal reflection with an angle of reflection 30

refraction into air with an angle of refraction of about 40°

4
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A fish appears to be 20 cm deep in water (nwater  = 1.33).  What is the actual depth of the fish?

15.0 cm

20.0 cm

26.66 cm

30.0 cm

26.66 cm

5
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Light refracts from water (n1 = 1.33) into air (n2 = 1.0).  The refracted ray emerges parallel to the surface.  The angle of incidence is … 

Correct answer:

48.6°

90°

0°

41.4°

48.6°

6
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The critical angle for light refracting from air (n1 = 1.0) into glass (n2 = 1.5) is …

There is no critical angle from air into glass.

90°

41.8°

0.66 rad

There is no critical angle from air into glass.

7
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<p><span>A clear glass slab with parallel surfaces is surrounded by air. Name the pairs of equal angles (select two correct answers)</span></p><p>ϑ<sub>i1</sub> and ϑ<sub>t1</sub></p><p style="text-align: left;">ϑ<sub>t1</sub> and ϑ<sub>i2</sub></p><p style="text-align: left;">ϑ<sub>i2</sub> and ϑ<sub>t2</sub></p><p style="text-align: left;">ϑ<sub>t2</sub> and ϑ<sub>i1</sub></p>

A clear glass slab with parallel surfaces is surrounded by air. Name the pairs of equal angles (select two correct answers)

ϑi1 and ϑt1

ϑt1 and ϑi2

ϑi2 and ϑt2

ϑt2 and ϑi1

ϑt1 and ϑi2

ϑt2 and ϑi1

8
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A fossilized insect is trapped halfway within an amber cube, whose sides measure 2 cm (namber  = 1.54).  What is the depth at which the insect appears to be trapped?

 0.65 cm

1.0 cm

1.54 cm

2.0 cm

 0.65 cm

9
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A ray hits an interface perpendicularly. This interface separates air (n1 = 1.0) from diamond (n2 = 2.50). The angle of refraction is ...

90°

45°

30°

0°

0°

10
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<p>What is the value of angle of deviation? (estimate)</p><p> A. 0° </p><p>B. 22.5° </p><p>C. 45° </p><p>D. 90° </p><p>E. 135° </p><p>F. 180</p>

What is the value of angle of deviation? (estimate)

A. 0°

B. 22.5°

C. 45°

D. 90°

E. 135°

F. 180

E. 135°

11
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Which of the following materials slows down light the most?

A. Vacuum (n =1)

B. Air (n ≈ 1.05)

C. Glass (n = 1.4)

D. Water (n = 1.33)

C. Glass (n = 1.4)

12
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13
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In normal incidence, there is …

A. no refraction, because there is no change in angle (direction)

B. no reflection, either

C. refraction, but there is no change in angle (direction)

D. only reflection

C. refraction, but there is no change in angle (direction)

14
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Total internal reflection occurs…

A. Always when a ray propagates from air to glass

B. Sometimes when a ray propagates from air to glass

C. Always when a ray propagates from glass to air

D. Sometimes when a ray propagates from glass to air

D. Sometimes when a ray propagates from glass to air