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A concave lens has a focal length of 50 ...

A concave lens has a focal length of 50 cm. Calculate its power.

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The correct Answer is:
`- 2 D`
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  13. An object of height 2 cm is placed at a distance of 15 cm in front of ...

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  14. A thin lens has a focal length of - 25 cm. What is the power of the le...

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  15. The power of lens is 2.5 D. What is its focal length ?

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  16. A convergent lens of power 8 D is combined with a divergent lens of po...

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  17. A concave lens is kept in contact with a convex lens of focal length 2...

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  18. Find the focal length and nature of lens which should be placed in con...

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