1.

Twp lenses of power +12 D and -2 D are placed in contact. The focal length of the combination is

Answer»

`+10` cm
`+ 12.5` cm
`+ 16.6` cm
`+8.3` cm

SOLUTION :Power P of lens combination `= P_(1) + P_(2) = + 12 D - 2 C = + 10 D`
`therefore` Focal LENGTH of lens combination `f = (1)/(P) = + (1)/(10) m = + 0.1 m = + 10 cm`


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