Question

A linear object of size 5 cm is placed in front of a convex mirror of focal length 20 cm at a distance of 20 cm in front of its reflecting surface. find the position, nature and size of the image fromed.

Answer 1

Heya

here's your answer

Height of the object, h = +5 cm

focal length of the convex mirror, f = +20 cm

And object distance of the convex mirror, u = -20 cm

= 1/v +1/u = 1/fz hence

1/v = 1/f - 1/u = 1/(+20) - 1/(-20) = 1/10

=> v = +10 cm

The +ve sign of v suggests that the image is formed behind the mirror and is a virtual image.

As linear magnification, m = h'/h = -v/u

∴ Height of the image, h' = - v/u ×h

h = -(+10)/(-20) × (+5)

= +2.5 cm

so, a virtual and erect image of size 2.5 cm is formed behind the mirror at a distance of 10 cm from the convex mirror.


glad help you
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@vaibhavhoax
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Answer 2

$\textbf{Answer is in Attachment !}$