MHT CET 2025 Physics question
A ray of light travelling through rarer medium is incident at a very small angle 'i' on a glass slab and after refraction its velocity is reduced by 20%. The angle of deviation is
Answer: (A)
Solution
After refraction the velocity becomes 80% of its original value, so the refractive index of glass relative to the rarer medium is . Snell's law: . For a very small angle, , so $ =
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