Height of the image of an object on an principal axis produced by a convex lens is double the focal length of lens is $20 c m$ , then image distance from the lens is:
$10 c m$
$30 c m$
$40 c m$
Both $(1)$ and $(2)$

10 c m

40 c m

30 c m

Both

(1)

and

(2)

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Height of the image of an object on an principal axis produced by a convex lens is double the focal length of lens is 20cm, then image distance from the lens is:10cm30cm40cmBoth (1) and (2)

Height of the image of an object on an principal axis produced by a convex lens is double the focal length of lens is $20 c m$ , then image distance from the lens is:
$10 c m$
$30 c m$
$40 c m$
Both $(1)$ and $(2)$