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a man is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of focal length 10cm. the diameter of the sun is 1.39*10^9m and mean distance from the earth is 1.5*10^11mthe diameter of the suns image on the paper is

megha pardeshi , 7 Years ago
Grade 12
anser 1 Answers
Arun

Last Activity: 7 Years ago

Dear Megha
 
When you draw a figure,
 
(D/2)/u = (d/2)/f
d = D*f /u
 = 1.39 *109 * 10 *10-2/1.5 *10¹¹ 
= 9.2 * 10-4 m.
 
Regards
Arun (askIITians forum expert)

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