Question

What is the angle between two plane mirrors when there are five images?
a) 60°
b) 45°
c) 90°
d) 0°
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Answer 1

Answer:

Explanation:

The number of images formed when two mirrors are placed at an angle theta to each other is given by: n = ( 360 / theta ) - 1.

Here, n = 5, so ( 360 / theta ) = n+1 = 6, hence theta = 360/6 = 60 deg.

So the mirrors are placed at an angle of 60 deg with each other.

Answer 2

Explanation:

let the required angle be x

then, the numbers of images formed by the mirror

=(360°/x)-1

=>5=(360°/x)-1

=>6=360°/x

=>x=60°