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Q.

A ray of light is incident at an angle of incidence 60° on the glass slab of refractive index 3. After refraction, the light ray emerges out from other parallel faces and the lateral shift between the incident ray and emergent ray is 43 cm. The thickness of the glass slab is ________ cm.

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answer is 12.

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Detailed Solution

The thickness of the glass slab t is 12 cm.

ℓ=tsini1-cos1μ2-sin2i
⇒43=tsin60°1-cos60°3-34

t = 12 cm 

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