Question

An object of height 6 cm is placed at a distance of 20 cm from a concave lens, its focal length is 10 cm. find the position and size of the image

Answer 1

Answer:

centre if curvature=2×f=20cm

as the object is placed at centre of curvature so the image will be formed at the same position and of the same size

so

position= 20cm in front of mirror and size is 6 cm

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Answer 2

Answer:

object distance is 20cm

focal length is 10 cm

therefore 2f•1=20cm

therefore object on c have image of same size

and same distance from lens

=} image position =2f•2

image size = -6cm