Question

Two plane mirrors are inclined at angle 40° between them. Number of images seen of a tiny object kept between them is
(A) Only 8
(B) Only 9
(C) 8 or 9
(D) 9 or 10 cm.​

Answer 1

Answer:

(360/Theta)-1.. We have to use the formula

Explanation:

Here Theta=40 degrees

Therefore substituting it we get,

(360/40)-1

9-1

=No of images =8

Answer 2

Given:

Angle of inclination of plane mirrors = ∠40°

To Find:

Number of images seen of a tiny object kept between them

Solution:

When two mirrors are placed at an angle of  A , then the number of images formed will be -

360°/A - 1

Substituting the value of A

360/40 - 1

= 9 - 1

= 8

Answer: The number of images seen of a tiny object kept between them is 8.