1.

The magnifying power of a telescope is m. If the focal length of the eye-piece is halved, then its magnifying power is .........

Answer»

`(1)/(2m)`
4m
2m
`m/2`

Solution :MAGNIFICATION of telescope m =`(f_0)/(f_e)`
If we take `f._e=(f_e)/(2)`
`m.=(f_0)/(f_e)=(2f_0)/(f_e)=2(m)`
`THEREFORE m.=2m`
`therefore`NEW magnification becomes DOUBLE.


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