Q34 of 284 Page 262

The power of a lens is + 2.0 D. Its focal length should be :

P = 1/f (m)

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32

A converging lens has a focal length of 50 cm. The power of this lens is:

 33

A diverging lens has a focal length of 0.10 m. The power of this lens will be:

 35

If a spherical lens has a power of,- 0.25 D, the focal length of this lens will be:

 36

The power of a concave lens is 10 D and that of a convex lens is 6 D. When these two lenses are placed in contact with each other, the power of their combination will be :