Question

Two plane mirrors are combined at 70°. A point object is placed on the bisector of angle between mirrors. Find the number of images formed by combination.

Answer 1

Answer:

Here the total number of images formed when object is placed as shown. Total images = 5

Explanation:

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Answer 2

The number of images formed by the combination is 5.

Two plane mirrors are combined at 70°. A point object is placed on the bisector of angle between mirrors.

We have to find the number of images formed by combination.

Concept : When two plane mirrors are kept facing each other at an angle Ф and an object is placed between them, then

1. number of images,  n = (360/Ф - 1) , if 360/Ф is even.
2. number of images, n = 360/Ф , if 360/Ф is odd.

Here, 360°/70° ≈ 5 ( odd)

∴ The number of images formed by the combination is 5.