Question

Convex lens and concave lens each having same focal length 25 centimetre are put in the contact of a combination of lens the power of diopter of the combination is

Answer 1

Answer:

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Explanation:

The focal length of the convex lens is 25 So the power will be d=1/f D=100/25(converting centimeters to metre) D=+4 Similarly, the focal length of the conscave lens is -25 So d=-100/25 D=-4 The power of the resultant= P=p1+p2 Here p1=4 P2=-4 So p=4-4 P=0 Thus the valve of the resultant power is zero