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The diameter of the sun is 1.4 x 109 m and its distance from the earth is 1.5 x 1011 m. Find the radius of the image of the sun formed by a lens of focal length 20 cm.
It is given that,
Diameter of the sun= 1.4 x 109 m
Distance between Earth and sun, u=1.5 x 1011 m
Focal length of the lens, f = 20cm
Using lens formula,
We know that magnification m is given by,