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MHT CET 2024 (4 May, Shift 1) · Refraction, Glass Slab & Apparent Depth

Refraction, Glass Slab & Apparent Depth question from MHT CET 2024 (4 May, Shift 1)

Q25MHT CET 2024 · 4 MAY · SHIFT 1Medium

Refraction, Glass Slab & Apparent Depth

A ray of light is incident normally on a glass slab to thickness 5 cm and refractive index 1.6. The time taken to travel by a ray from source of light to surface of slab is same as to travel through glass slab. The distance of source from the surface is

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Answer: (b)

Time in glass: $\dfrac{t}{v} = \dfrac{\mu t}{c} = \dfrac{1.6 \times 5}{c} = \dfrac{8\text{ cm}}{c}$ .
Time in air from source: $\dfrac{x}{c}$ .
Equal times: $x = \mu t = 8$ cm.
So the answer is (b) 8 cm.

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