JEE Mains · Physics · STD 12 - 9. Ray optics and optical instruments
For a thin symmetric prism made of glass (refractive index \(1.5\)), the ratio of incident angle and minimum deviation will be _______.
- A \(3 : 4\)
- B \(3 : 2\)
- C \(2 : 1\)
- D \(1 : 2\)
Answer & Solution
Correct Answer
(B) \(3 : 2\)
Step-by-step Solution
Detailed explanation
For a thin prism, the angle of minimum deviation is given by \(\delta_m = (\mu - 1)A\). At the position of minimum deviation, the angle of incidence \(i\) and angle of emergence \(e\) are equal, and the angle of refraction is \(r = \dfrac{A}{2}\). Using Snell's law for small…
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