Question

what is the number of image formed when angle between two plane mirrors is 20 degree

Answer 1

No of images = 180/A - 1 where A is the measure of the angle between the plane mirrors

180/20-1 = 90-1= 89

Hence a total of 89 images will form

NOTE: you have to subtract 1 (I.e -1) only when 180/A is an even no

Hope it helped you

Answer 2

Explanation:

The formula for this is 360°/A

A =20°

therefore,

360°÷20°

=18

therefore,the number of images formed are 18.