A beam of light travelling in water is incident on a glass which is immersed...
PHYSICS
JAMB 2023
A beam of light travelling in water is incident on a glass which is immersed in the water. The incident beam makes an angle of \(40^o\) with the normal. Calculate the angle of refraction in the glass.
[Refractive index of water = 1.33, Refractive index of glass = 1.5]
- A. \(29.36^o\)
- B. \(25.37^o\)
- C. \(37.21^o\)
- D. \(34.75^o\)
Correct Answer: D. \(34.75^o\)
Explanation
\(n_1\)=1.33; \(n_2\)=1.5; i=40°; r= ?
from snells law:
\(n_1\) x sini=\(n_2\)x sinr
⇒1.33 x sin40°=1.5 x sinr
⇒sinr=0.5700
⇒r = \(sin^-1\) (0.5700)
⇒ r= 34.75
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