A light ray travels inside a block of crown glass whose index of refraction is

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

A light ray travels inside a block of crown glass whose index of refraction is 1.501.50. What is the critical angle for the glass–air boundary, expressed to the nearest degree? (a) 49∘49^{\circ} (b) 42∘42^{\circ} (c) 34∘34^{\circ} (d) 26∘26^{\circ}

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