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CBSE Class 10 Answered

TWO LENSES HAVE POWER OF +2D AND -4D. WHAT IS THE NATURE AND FOCAL LENGTH OF EACH LENS  
Asked by kamakshigaur | 24 Dec, 2020, 04:32: PM
answered-by-expert Expert Answer
Power P of the lens , P = 1/ f  , where f is focal length expressed in metre . Sign of power of converging lens or convex lens is +ve . 
 
Sign of power of diverging lens or concave lens is -ve. Unit of power of lens is D , diopter
 
If Power P = +2D = 1/f or focal length f = 1/2 m = 50 cm . This lens is convex lens
 
If power P = -4D = 1/f or focal length f = -1/4 m = -25 cm . This lens is concave lens.
 
Answered by Thiyagarajan K | 24 Dec, 2020, 08:19: PM

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