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  4. Two plane mirrors are inclined at 70°. A ray incident on one mirror at angle, θ after reflection falls on second mirror and is reflected from there parallel to first mirror. The value of θ is

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Q. 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

NEETNEET 2013Ray Optics and Optical Instruments

Solution:

Different angles as shown in the figure.
$\theta+40^{\circ}=90^{\circ} $
$\therefore \theta=90^{\circ}-40^{\circ}=50^{\circ}$

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