Correct Answer: Option C

Explanation

n = \(\frac{sin i}{sin r}\)

sin r = \(\frac{30^o}{n}\)

sin r = \(\frac{0.5}{1.5}\)

sin r = 0.3333

r = sin\(^{-1}\)(0.333) = 19.5º

At minimum deviation, the ray passes symmetrically, so A = 2r

A = 2 x 19. 5 = 38.94

But minimum deviation = 2i - A

 = 2 x (30º) - 38.94 = 21.06º

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