A ray of light is incident at an angle of 60 ∘ on one face of a prism of angle 30 ∘ . The emergent ray of light makes an angle of 30 ∘ with incident ray. The angle made by the emergent ray with second

Question

A ray of light is incident at an angle of 60 ∘ on one face of a prism of angle 30 ∘ . The emergent ray of light makes an angle of 30 ∘ with incident ray. The angle made by the emergent ray with second face of prism will be:

TestHub · Accepted Answer

Incidence angle on one face of a prism, $i = 60 °$ . Angle of the prism, $A = 30 °$ ,

the mergent ray that makes an angle $30 °$ with incident ray. We know, deviation angle, $δ =$ Angle between the incident ray and emergent ray $= 30 °$

$\Rightarrow δ = i + e - A$
$\Rightarrow 30 ° = 60 ° + e - 30^{\circ}$
$\Rightarrow e = 0 °$ . So, the angle with the face, $= 90 °$ .

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