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Refraction at a Spherical Surface

A ray of ligh...

Question

A ray of light falls on the surface of spherical glass paperweight making an angle $α$ with the normal and is refracted in the medium at an angle $β$ . The angle of deviation of the emergent ray from the incident ray is

A

(α - β)

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B

2 (α - β)

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C

\frac{(α - β)}{2}

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D

(α + β)

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Solution

The correct option is B $2 (α - β)$
As seen in the figure at the first interface the deviation is $α - β$ and at the second interface the angle of incidence is $β$ again the deviation is $α - β$
total deviation is $2 (α - β)$ .

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