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 `10cm`. The diameter of the sun 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 ?

`6.5xx10^(-5)m`

`12.4xx10^(-4)m`

`9.2xx10^(-4)m`

`6.5xx10^(-4)m`

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The correct Answer is:

Angle subtended by sun
`theta=(1.39xx10^9)/(1.5xx10^(11))=9.2xx10^-4m`

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