lenses of power +2D and -2D are put together what will be the focal length
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P = 1/F
first we need to find out the power of the resulting lens
P = 2+(-2)
P = 0
P = 1/F
F = 1/P
F= 1/0
F= infinity
first we need to find out the power of the resulting lens
P = 2+(-2)
P = 0
P = 1/F
F = 1/P
F= 1/0
F= infinity
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