Question

the number of image formet of an object placed between two plane mirror inclined at right angles to each other is:
a two
b five
c one
d. three

Answer 1

Formula to find the number of reflections formed= (360/n)-1
Where n is the angle where it is kept.

Putting the values we have
(360/90)-1
4-1
3

So your answer to the question is the fourth option , three

Answer 2

Number of images formed on plane mirrors = (360/90 - 1 ) = 3 .


Option ( d) - three.