Question

how many images are formed when two plane mirrors are kept at 90° to eachother? Please explain​

Answer 1

$ur \: answer$

If you have a chance to look carefully at the images formed by right angle mirrors, then you will notice that right angle mirrors produce three images.

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Answer 2

90° angle= right angle

If you have a chance to see the image formed by the right angle mirrors just see it

Your answer is:-

The mirror forms three images.