Power of a spherical lens is mainly dependent upon its 1 Length 2 Width 3 Focal length 4 Clari...........

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Power of a spherical lens is mainly dependent upon its

1. Length

2. Width

3. Focal length

4. Clarity

Select the correct answer using the codes below.

2 and 4 only

1, 2 and 4 only

3 only

1, 2, 3 and 4

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Explanation:

Justification: Two lenses with same focal length can have different lengths, width and clarity; yet their power will remain the same. So, 1, 2 and 4 are incorrect.Power of lens is the ability of the lens to converge the rays of light falling on it. Definition: The power of a lens is the reciprocal of its focal length in meters. When, f = 1 m, P = 1/f = 1/1 = 1 dioptre. 1 dioptre is the power of a lens whose focal length is 1 meter.