Two lens of power -2.5D and 1.5D are placed in contact . Find total pawer of combination of lens . Calculate the focal length of this combination
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P1 = -2.5D
P2 = 1.5D
Total power = P1 + P2
= -2.5 + 1.5
= -1 D
P = 1/f (in metres)
F = 1/-1 = -1 m = -100 cm
P2 = 1.5D
Total power = P1 + P2
= -2.5 + 1.5
= -1 D
P = 1/f (in metres)
F = 1/-1 = -1 m = -100 cm
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