The image obtained with a convex lens is erect and its length is 4 times the length of the object. If the focal length of the lens is 20 cm, (a) calculate the object and image distances. (b) Find the size of image.
Given,
Focal length = f = 20 cm
Magnification = m = 4
(a) Let,
u = Object distance
v = Image distance
We know,
Using,
(b) Size of the image is 4 times the size of the object.
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