JEE Mains · Physics · STD 12 - 9. Ray optics and optical instruments
A ray of light passing through an equilateral prism is having velocity \(2.12 \times 10^8\) m/s in the prism material, then the minimum angle of deviation is _________ degrees.
- A \(45\)
- B \(30\)
- C \(28\)
- D \(58\)
Answer & Solution
Correct Answer
(B) \(30\)
Step-by-step Solution
Detailed explanation
Velocity of light in vacuum, \(c = 3 \times 10^8\) m/s Velocity of light in the prism, \(v = 2.12 \times 10^8\) m/s Refractive index of the prism material, \(\mu = \dfrac{c}{v} = \dfrac{3 \times 10^8}{2.12 \times 10^8} \approx 1.414 \approx \sqrt{2}\) For an equilateral prism,…
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