1.

A biconvex lens of focal length f forms a circular image of radius r of sun is focal plane. Then, which option is correct?

Answer»

`pir^(2)propf`
`pir^(2)propf^(2)`
If lower HALF part is covered by black SHEET, then area of the IMAGE is equal to `pir^(2)//2`
If f is double, INTENSITY will increase

Solution : `r=f TAN theta`
or `r prop f`
`:. pi r^(2)propf^(2)`


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