Question

A 10cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 12 cm. The distance of the object from the lens is 18 cm. Find the nature position and size of the image formed

Answer 1

height of object = 10 cm

focal length(F) = 12 cm

object distance(U) = -18 cm

By the lens formula => 1/F = 1/V - 1/U

                                => 1/12 = 1/V -(- 1/18)

                                => 1/12 - 1/18 = 1/V

                                => 1/36 = 1/V

                                => V = 36 cm

hi/ho = v/u

hi/10 = 36/-18

hi = -2 x 10

hi = -20 cm

Therefore the image is real and inverted,image distance is 36 cm and image height is -20 cm. Magnification of object is twice that of image.

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Answer 2

Real and inverted

36 cm

-20