PHYSICS (2013) Discuss

From the diagram above, calculate the incident angle i.

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Question 31
PHYSICS (2013) Q 31 image
A

41

B

49

C

55

D

61

Explanation

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Correct option: A

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Iyinoluwa Orunkoya said on March 8, 2020 06:26am
Correct.
Sin i/Sin r = refractive index n
Since r=90°, then I= critical angle C
Therefore, sin C/sin r = 1/n (glass)
Sin C/Sin 90° = 1/1.52
Sin C/ 1 = 0.66
Sin C = 0.66
C = Sin–¹ 0.66
C = 41°
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