NDA 2026 Physics question
Three parallel glass slabs of refractive indices 1·5, and 1·5 respectively have widths 2 mm, 1 mm and 4 mm. The combination is in air. Light is incident at the first slab at an angle of incidence . What is the angle with respect to the normal at which the light will emerge from the final surface ?
Answer: (C)
Solution
For parallel slabs, Snell's law gives across every interface. Since the light starts and ends in
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