Question

The dispersive power of two lenses are 0.01 and 0.02. Focal length of a lens is +10 cm then what should be the focal length of second lens so that they form and achromatic combination?
1)Diverging lens having focal length 20cm
2)Diverging lens having focal length 10 cm
3)Converging lens having focal length 20cm
4) Converging lens having focal length
10cm​

Answer 1

Answer:

90 cm

Explanation:

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