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The formula for finding this is : - n=360/x or n=360/x - 1, where n is the no. of images, x is the angle of inclination between the two mirrors & n is always an odd integer.
So,if the angle between the two mirrors is 90 degrees, n=360/90 - 1= 4-1 =3

the formula is : n = 360/x-1 in the give formula the terms are : 1. n = number of the images formed 2. x = the angle given : mirrors are at 90 degree angles therefore n = 360/x-1 n = 360/90-1 n = 4-1 n = 3 ∴ the number of images formed are 3.