A ray of light traveling from a rectangular glass block of refractive index 1.5 into
PHYSICS
WAEC 2019
A ray of light traveling from a rectangular glass block of refractive index 1.5 into air strikes the block at an angle of incidence of 30. Calculate its angle of refraction.
- A. 48.6°
- B. 19.5°
- C. 20.0°
- D. 45.0°
Correct Answer: B. 19.5°
Explanation
n = \(\frac{sin I}{sin r} = \frac{sin 30^o}{sin r}\)
1.5 = \(\frac{\sin 30^o}{sin r}\)
1.5 sin r = \(\frac{\sin 30^o}{1.5} = \frac{0.5}{1.5}\)
sin r = 0.3333
= 19.47\(^o\)
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