Q. 503.5( 4 Votes )

The focal length

Answer :


Focal length of Concave mirror = -30cm (focal length of concave mirror is negative)

Distance of object from mirror = -20 cm (since object is on the left-hand side of lens and acc. To our sign convention)

Distance of image from mirror = ?

Formula Used

Mirror formula

Magnification formula

Using Mirror formula

V = 60 cm

Hence the image is at a distance of 60cm from mirror and is virtual.

Using magnification formula

M = 3

Hence, the image is 3 times the object and is erect.

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