A ray of light is incident normally on one of the faces of a prism of apex angle 30 ° and refractive index 2 . The angle of deviation of the ray is

Question

A ray of light is incident normally on one of the faces of a prism of apex angle 30 ° and refractive index 2 . The angle of deviation of the ray is, 30 °, 45 °, 15 °, none of these

MARKS App · Accepted Answer

Using Snell’s law for the refraction at AC, we get μ sini = ( 1 ) sinr 2 sin 30 ° = sinr sinr = 1 2 ⇒ r = 45 ° ∴ Angle of deviation = 45 ° − 30 ° = 15 ° .

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