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:

Correct answer: D. 50^ The actual situation is shown in the given degree aligned θ+40^ ^ & =90^ ^ θ & =90-40=50^ ^ aligned

NEET 2013

Exam: NEET
Year: 2013
Subject: Physics
Chapter: Ray Optics

NEET 2013 · Physics · Ray Optics

Two plane mirrors are inclined at 70^ . A ray incident on one...

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:

Two plane mirrors are inclined at 70^ . A ray incident on one mirror at angle, θ after reflection falls on second

Options

A $45^{\circ}$
B $30^{\circ}$
C $55^{\circ}$
D $50^{\circ}$

Correct answer

D. $50^{\circ}$

Step-by-step solution

The actual situation is shown in the given degree Two plane mirrors are inclined at 70^ . A ray incident on one mirror at angle, θ after reflection falls on second

\begin{aligned} \theta+40^{{}^{\circ}} & =90^{{}^{\circ}} \\ \Rightarrow \quad \theta & =90-40=50^{{}^{\circ}} \end{aligned}

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