Q33 of 284 Page 262

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

P = 1/f (m)

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31

The focal lengths of four convex lenses P, Q, R and S are 20 cm, 15 cm, 5 cm and 10 cm, respectively. lens having greatest power is:

 32

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

 34

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

 35

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