A light ray enters a rectangular glass slab from air. At the first surface of refraction, $i$ is the angle of incidence and $r$ is the angle of refraction. Which of the following statements is correct?

$r = i$

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$r < i$

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$r > i$

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Cannot be determined

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Solution

The correct option is B
$r < i$

When light is incident obliquely from a medium of lower optical density to that of greater optical density, the refracted ray bends towards the normal. Therefore, in the case of refraction of light in a rectangular glass slab, if $i$ is the angle of incidence and $r$ is the angle of refraction, then $i > r$ .

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A light ray enters a rectangular glass slab from air. At the first surface of refraction, i is the angle of incidence and r is the angle of refraction. Which of the following statements is correct?

A light ray enters a rectangular glass slab from air. At the first surface of refraction, $i$ is the angle of incidence and $r$ is the angle of refraction. Which of the following statements is correct?