In the figure given below, choose the correct option?

$∠ r = 30^{\circ}$

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$∠ r > 30^{\circ}$

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$∠ r < 30^{\circ}$

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$A B ∥ C D$

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Solution

The correct option is C
$∠ r < 30^{\circ}$

When light travels from rarer to denser medium, it bends towards normal.

In the given figure, there is different media around glass slab. So, incident ray and emergent ray will never be parallel.

Here, emergent ray is in denser medium and incident ray is in rarer medium. Hence, the angle of emergence will be less than angle of incidence.

Hence, the correct option is 'C'

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