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

Options

A. `9.2xx10^(-4)` m
B. `6.5xx10^(-4)` m
C. `6.5xx10^(-5)` m
D. `12.4xx10^(-4)` m

Answer

A, B, D

Explanation

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.