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If a convex lens of focal length 20 cm a...

If a convex lens of focal length 20 cm and a concave lens of focal length 30 cm are kept in contact with each other .
(i) What will be the focal length of the combination ?
(ii) What will be the power of the combination ?
(iii) What will be the behaviour of the combination ?

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  15. Find the power of a convex lens of focal length 12.5 cm.

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  16. If for a lens , f= -20 cm, what is the power of the lens ?

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  17. An object of height 4 cm is kept in front of a concave lens of focal l...

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