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CBSE Class 10 Answered

The power of convex lens of focal length 20 cm is
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Asked by varma.renu9481 | 17 Mar, 2023, 18:28: PM
answered-by-expert Expert Answer

The power of convex lens of focal length 20 cm is ______. [SSC class 10th Part I -2023]

(a)    +5.0 D

(b)   0.20 D

(c)    -5.0 D

(d)   0.5 D

Solution:

Given that,

Focal length, f = 20 cm = + 0.2 m

∵ for convex lens, the focal length is positive

Power of lens, P = 1/f

 therefore P equals 10 over 2 equals plus 5.0 space D

Answered by Jayesh Sah | 17 Mar, 2023, 19:03: PM
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