Question

# How do we calculate the number of images formed by a pair of plane mirrors ? What will be the number of images if not calculated is a fraction? Calculate the number of images formed if the angle between the mirrors is 1) 50° 2) 72°.

Solution

## We can find the number of images formed if we know the angle between the plane mirrors. This is given by formula: n= (360/ ϴ) - 1 if 360 /ϴ is even n= 360/ ϴ if it comes odds 1)if the angle is 50    Number of images=(360/50)-1=7.2 We take 7 as image will not be taken as fraction. 2)if the angle is 72 Number of images=(360/72)=5 (No -1 since it is odd)

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