Question

Two adjacent walls of a room and the ceiling are made of mirrors. If an object is placed in the room, how many images of it will form, and why?

Pls explain in detail...when I'm doing I'm getting 9+1=10 images, but the answer is 7...but how?

Answer 1

The number of images formed when two mirrors are inclined to each other is given by :

n=(360/θ -1)
here θ= 90°[since walls are perpendicular]

so, number of images=n=360/90-1
=4-1
=3

These 3 images are formed by combination of two adjacent walls with object itself acts as objects for ceiling mirror. So totally 4 images are formed .

Hence total number of images formed are 4+3= 7