Sainik School Entrance Exam 2018 Solved Paper

Question : 86 of 150

Marks: +1, -0

As the angle between two plane mirrors is decreasing gradually, the number of images of an object placed between them:

first increases then decreases
first decreases then increases
increases
decreases

Solution:

(c) If the image of an object is viewed in two plane mirrors that are inclined to each other more than one image is formed. The number of images depends on the angle between the two mirrors. The number of images formed in two plane mirrors inclined at an angle

\mathrm{A}

to each other is given by the formula below.
Number of images

={360}/{\A}-1

As the angle gets smaller (down to 0 degrees when the mirrors are facing each other and parallel) the smaller the angle the greater the number of images.

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