A ray of light incident at an angle \(\theta\) in a rectangular prism grazes the...
PHYSICS
WAEC 2017
A ray of light incident at an angle \(\theta\) in a rectangular prism grazes the surface of the prism on emerging from the prism. Determine the value of the angle. [Absolute refractive index of the material of the prism is 1.5]
- A. 41.8°
- B. 48.2°
- C. 60.8°
- D. 90.0°
Correct Answer: A. 41.8°
Explanation
\(\eta = \frac{1}{sin\theta}\)
\(1.5 = \frac{1}{sin\theta}\)
\(sin\theta = \frac{1}{1.5} = 0.667\)
\(\theta = sin^{-1}(0.667) = 41.835°\)
\(\approxeq 41.8°\)
Post an Explanation Or Report an Error
If you see any wrong question or answer, please leave a comment below and we'll take a look. If you doubt why the selected answer is correct or need additional more details? Please drop a comment or Contact us directly. Your email address will not be published. Required fields are marked *