Question

A convex lens of focal length f produces a real
image 3 times as that of size of the object, the
distance between the object and the lens is
​

Answer 1

Explanation:

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Answer 2

Answer:

-4f/3

Explanation:

size of image = 3 size of the object

⇒m = size of image / size of object=3   (given that image is real)

Then m = −3

⇒ v/u=−3        v=−3u,    u=?    f= +ve  i.e., +f

1/v − 1/u = 1/f

−13/u − 1/u = 1/f

−1−3/3u = 1f

−4/3u = 1/f ⇒ u = −4f/3

∴ Distance of object is = 4f/3