Question

A 3 cm tall object is placed 18 cm in front of a
concave mirror of focal length 12 cm. At what
distance from the mirror should a screen be placed
to see a sharp image of the object on the screen.
Also calculate the height of the image formed.​

Answer 1

Answer:

h₀ = 3cm

u = –18cm

f = –12cm

Explanation:

∵ 1 = 1 + 1 (mirror Formula)

f u v

-1 = -1 + 1

12 18 v

1 = -1 + 1

v 12 18

1 = -3 + 2

v 36

v=–36cm

The screen must be placed at a distance of 36cm away from mirror to obtain a sharp image (on the same side of mirror)

m = -v = hi (Magnification of mirror)

u h₀

-(-36) = hi

-18 3

hi = –6cm is the height of image formed

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