Question

If the angle between two plane mirrors is 120
, then
calculate the number of images formed

Answer 1

Explanation:

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NO OF IMAGES = 360/Ф - 1 = 360/120 - 1 = 3 - 1 = 2 IMAGES

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Answer 2

The number of images formed when the object is placed between two plane mirrors:

⇒ θ = Angle between the two plane mirrors, and n = number of images formed

If 360/θ = even number

=> n = 360/θ

If 360/θ = odd number and the object lies symmetrically

n = 360/θ - 1

If 360/θ = odd number and the object lies asymmetrically

n = 360/θ

If 360/θ = fraction

⇒ n = only integer part of 360/θ

CALCULATION:

Given that: θ = 120°

so, Number of images (n) = (360/120) = 3