• An object of height 2 cm is placed at a distance of 60 cm before a concave lens of focal length 20 cm. How do you find the position of the object and the height of the image?
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Given-:
height of object = 2cms
object distance = 60 cms = u
focal length = 20 cms
therefore, radius of curvature = 2f =2(20) =40 cms
so the object is placed beyond center of curvature.
height of image can be found out by the formula
hi/ho = v/u
to find 'v' use the lens formula.
we get the height of image as 0.5 cms
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