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The power of a combination of two lenses X and Y is 5 D. If the focal length of lens X be 15 cm : (a) calculate the focal length of lens Y.

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The power of a combination of two lenses X and Y is 5 D. If the focal length of lens X be 15 cm :

(a) calculate the focal length of lens Y.

(b) state the nature of lens Y.

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(b) Lens Y is a concave lens since it has negative focal length.

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