Question

. An object is placed between two mirrors that
are at right to each other.how many images are formed​

Answer 1

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INFINITE.

The images formed in the two mirrors of the object is infinite.

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HOPE IT HELPS...

Answer 2

The formula used is

360/Ф  - 1

where, Ф is the angle

So for 90° it is

360/90 - 1

4 - 1

= 3 images are formed.