Question

shamtaz curie is doing an experiment with glass slab she focused the light towards the glass slab at angle 30 degree . what would be the angle of emergence
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Answer 1

The angle of emergence is 48.59°

Explanation:

The light passes from glass medium to air.

The angle of incidence and emergence is given by Snell's law:

n₁ sin θ₁ = n₂ sin θ₂

Where,

n₁ = Refractive index of glass slab = 1.5

θ₁ = Angle of incidence = 30°

n₂ = Refractive index of air = 1

θ₂ = Angle of emergence = ?

On substituting the values, we get,

1.5 × (sin 30) = 1 × (sin θ₂)

1.5 × 1/2 = 1 × (sin θ₂)

sin θ₂ = 0.75

θ₂ = sin⁻¹ (0.75)

∴ θ₂ = 48.59°