Question

An object with a 4 cm height is put at 30 cm in front of a convex lens which has a 20 cm focal length. The distance of the generated image is… *

Answer 1

Explanation:

given that in the ques -

height of object = 4cm

object distance(u) = -30 cm

focal length (f) = + 20cm

(V)image distance = ???

from Lens formula

we came to knew that -

1/f = 1/v - 1/ u

1/20 = 1/v - (1/-30)

1/20 = 1/v + 1/30

1/v = 1/20 -1/30

1/v = (3 - 2) / 60

1/v = 1/60

v = 60 cm

image will be made on 60 cm distance from the lens.....

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