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 lateral shift between incident ray and emergent ray is 4 3 cm . The thickness of the glass slab is _____ cm .

Question

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 lateral shift between incident ray and emergent ray is 4 3 cm . The thickness of the glass slab is _____ cm .,

MARKS App · Accepted Answer

From snell's law, sin i sin r = 3 ⇒ sin 60 ° sin r = 3 ⇒ r = 30 ° From the diagram shown, d = t sin i - r cos r ⇒ t × 1 2 3 2 = 4 3 ⇒ t = 12 cm

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