Two thin lenses of power +3.5 D and –2.5 D are placed in contact. Find the power and focal length of the lens combination.
Two thin lenses of powers,
P1 = +3.5 D P2 = -2.5 DPower of combination, P = P1 + P2 = 3.5 + (- 2.5) = 1 D Power of combination, P = 1 D.
Thus the combination acts as a convex lens of power 1D (positive sign)Focal length of combination, f =
= 1 m.
P1 = +3.5 D P2 = -2.5 DPower of combination, P = P1 + P2 = 3.5 + (- 2.5) = 1 D Power of combination, P = 1 D.
Thus the combination acts as a convex lens of power 1D (positive sign)Focal length of combination, f =
= 1 m. AI is thinking…
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