1.

A compound microscope consists of an objective lens with focal length 1.0 cm and eye piece of the focal length 2.0 cm anda tube 20 cm from eye lens, the distance between the two lenses is

Answer»

`6.00 cm`
`7.75 cm`
`9.25 cm`
`11.0 cm`

Solution :Magnification, of compound micrscope
`m = m_(o) XX m_(E) = (L/f_(o)) xx (D/(f_(e)))`
Here, `L = 20 cm, d = 25 cm` (near point), `f_(o) = 1 cm` and `f_(e) = 2 cm`
`:. m = (20)/(1) xx (25)/(2) = 250`


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