Question

As the angle between two plane mirrors is decreased gradually, the number of images of an object placed between them:
A. increases gradually
B. decreases gradually
C. first increases then decreases
D. first decreases then increases

Answer 1

Answer:

(A) increases gradually.

Explanation:

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Answer 2

As the angle between two plane mirrors is decreased gradually, the number of images of an object A. increases gradually.

Explanation:

• Two plane mirrors are placed with an object in between them. Two mirrors are placed in such a way that is moved as book.
• When both the mirror are 180° then single image is obtained.
• When the angle of mirrors are decreases, object along with the images formed in the mirrors are reflected increases. When the angle increases, images formed decreases.
• Number of image formed is determined with the formula given below:
• $n=\frac{360}{\theta}-1$
• Where, θ is angle between mirrors.