# Describe the Nature of Image Formed When the Object is Placed at a Distance of 20 Cm from a Concave Mirror of Focal Length 10 Cm - Science

Describe the nature of image formed when the object is placed at a distance of 20 cm from a concave mirror of focal length 10 cm

#### Solution

Object distance (u) = - 20 m                           ( negative, due to sign convention)
Focal length (f) = -10 m                                   ( negative, due to sign convention)
Image distance = ?
From the mirror formula, we know that:

1/v+1/u=1/f

or 1/v+1/-20=(-1)/10

or 1/v-_20^1=_10^-1

or 1/v=(-1)/10+1/20

or 1/v=-1/20orv=-20m

Here, the negative sign means that the image is formed on the left side of the mirror. Thus, it is a real and inverted image, formed at a distance of 20 m from the mirror.

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#### APPEARS IN

Lakhmir Singh Class 10 Physics (Science)
Chapter 4 Reflection of Light
Q 10 | Page 198