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The Focal Lengths of Four Convex Lenses P, Q, R And S Are 20 Cm, 15 Cm, 5 Cm and 10 Cm, Respectively. the Lens Having Greatest Power is : (A) P (B) Q (C) R (D) S - Science

The focal lengths of four convex lenses PQR and S are 20 cm, 15 cm, 5 cm and 10 cm, respectively. The lens having greatest power is :
(a) P
(b) Q
(c) R
(d) S

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Solution

 R

Power=`1/"focal length"` 

Therefore, a lens with a small focal length will have more power.

  Is there an error in this question or solution?
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APPEARS IN

Lakhmir Singh Class 10 Physics (Science)
Chapter 5 Refraction of Light
Q 31 | Page 262
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