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Three thin lenses are combined by placin...

Three thin lenses are combined by placing them in contact with each other to get more magnification in an optical instrement. Each lens has a focal length of 3 cm. If the least distance of distinct vision is taken as 25 cm, the total magnification of the lens combination in normal adjustment is

A

9

B

26

C

300

D

3

Text Solution

Verified by Experts

The correct Answer is:
B
The total magnification of the lens is given by,
`M=1 + D/f`
`f= 1/f_(1) + 1/f_(2) + 1/f_(3) = 1/3+ 1/3+1/3= 1cm`
` implies M=1+ 25/1= 26`
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