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The diameter of the sun is 1.4 x 10^9 m and its distance from the earth is 1.5 x10^11 m. Find the radius of the image of the sun

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asked Mar 30, 2018 in Physics by Nisa (2,540 points) ● 1 ● 3

The diameter of the sun is 1.4 x 109 m and its distance from the earth is 1.5 x1011 m. Find the radius of the image of the sun formed by a lens of focal length 20 cm.

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answered Mar 30, 2018 by rubby (7,550 points) ● 1 ● 3 ● 5
selected Apr 1, 2018 by Vikash Kumar
 
Best answer

u = –1.5 x 1011 m ; f = +20 x10–2 m

Since, f is very small compared to u, distance is taken as ∞  . So, image will be formed at focus.

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