two lenses of power minus - 7.5 D and -2.5 D are placed in contact. find the focal length of the combination
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Power in combination is -7.5D-2.5D
That gives -10D
1/f equal to 1/f1 plus 1/f2
That gives P1 plus P2
1/f is -10D.
F is equal.to 1/-10D
Then f equal to-0.1m
That is focal length is -10 cm
That gives -10D
1/f equal to 1/f1 plus 1/f2
That gives P1 plus P2
1/f is -10D.
F is equal.to 1/-10D
Then f equal to-0.1m
That is focal length is -10 cm
Kr77:
but the answer is - 0.2m
How
I cant
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