Q. 503.5( 4 Votes )

The focal length

Answer :

Given


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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