Question

Assertion :When two plane mirrors are kept perpendicular to each other as shown (O is the point object), 3 images will be formed. Reason: In case of multiple reflection, image of one surface can act as as object for the next surface.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

If $\theta$ be the angle between 2 mirrors, then the number of images formed will be,

$m=\frac{2\pi }{\theta }-1$

Thus, if $\theta =90$

then $m=3$

Also, in case of multiple reflections first image of an object acts as an object for the second image.
Thus, both assertion and reason are correct