1.

A boy focuses Sunlight on a paper by using biconvex lens of focal length 10 cm. Such that paper can be burnt. Diameter of Sun is 1.39 xx 10^9 m and distance of Earth from Sun is 1.5 xx 10^(11) m approximately, then the diameter of image of Sun on paper will be

Answer»

`9.2xx10^(-4)` m
`6.5xx10^(-4)` m
`6.5xx10^(-5)` m
`12.4xx10^(-4)` m

Solution :As we know, `|v/u|=("IMAGE height")/("object height")`
`therefore` Image height =`|v/u|XX` object height
`=(10^(-1))/(1.5xx10^(11))xx(1.39xx10^9)`
`=0.92xx10^(-3)` m
`=9.2xx10^(-4)` m
Hence, diameter of image of SUN is `9.2 xx 10^(-4)` m.


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