ICSE Class 10 Answered
two thin lenses of power +3.5 D and -2.5 D are placed in contact . What is the focal length of the lens combination
Asked by smithasumi1976 | 12 Sep, 2021, 12:23: PM
Expert Answer
Power of combination of lenses is +3.5 + (-2.5) = 1 D
The focal length of the combiation of lenses (in metre) = 1/ (power of lens combination) = 1/ = 1 m
Focal length of lens combination (in centimetre) = 100 cm
Answered by Shiwani Sawant | 20 Sep, 2021, 01:43: PM
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