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Light is incident on a glass block as shown in figure. If $θ_{1}$ , is increased slightly, what happens to $θ_{2}$ ?

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$θ_{2}$ changes abruptly, since the ray experiences total
internal reflection

$θ_{2}$ also increases slightly

$θ_{2}$ it unchanged

$θ_{2}$ decreases slightly

answer is C.

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Detailed Solution

As $θ_{1}$ increases, $α$ also increases. so, (90° - $α$ ) decreases and hence $θ_{2}$ decreases.

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