The diameter of the sun is

Question:

The diameter of the sun is $1.4 \times 10^{9} \mathrm{~m}$ and its distance from the earth is $1.5 \times 10^{11} \mathrm{~m}$. Find the radius of the image of the sun formed by a lens of focal length $20 \mathrm{~cm}$.

Solution:

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