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Two plane mirrors are inclined at $70^{\circ}$. A ray incident on one mirror at angle, $\theta$ after reflection falls on second mirror and is reflected from there parallel to first mirror. The value of $\theta$ is:
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2097 Upvotes
Verified Answer
The correct answer is:
$50^{\circ}$
The actual situation is shown in the given degree
$$
\begin{aligned}
\theta+40^{\circ} & =90^{\circ} \\
\Rightarrow \quad \theta & =90-40=50^{\circ}
\end{aligned}
$$
$$
\begin{aligned}
\theta+40^{\circ} & =90^{\circ} \\
\Rightarrow \quad \theta & =90-40=50^{\circ}
\end{aligned}
$$
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