A boy is trying to start a fire by focus...

A boy is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of focal length 10 cm.The diameter of the sum is `1.39xx10^9`m and its mean distance from the earth is `1.5xx10^11` m. What is the diameter of the sun's image on the paper?

`9.2xx10^-4`m

`6.5xx10^-4`m

`6.5xx10^-5`m

`12.4xx10^-4`m

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