Question

# A convex lens of focal length 25 cm and a concave lens of focal length 10 cm are placed in close contact with one another. (a) What is the power of this combination ? (b) What is the focal length of this combination ? (c) Is this combination converging or diverging ?

Solution

## Power =  1f where f is focal length in meter now p1 = 10025 = 4 (for convex lens) p2 =−10010 = -10(power is negative because focla length of concave lens is negative) now resultant power = p1+p2 = 4+(-10) =-6 F=1P=1−6=−0.16m and the combination is diverging.PhysicsScience for Tenth Class - Part I - PhysicsStandard X

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