Define 1 Diopter Power of Lens

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Solution

$D e a r S t u d e n t, D i o p t r e i s t h e u n i t o f p o w e r o f a l e n s . P o w e r = \frac{1}{f} \Rightarrow 1 D = \frac{1}{10^{- 2} m} T h e r e f o r e, 1 D i s t h e p o w e r o f a l e n s h a v i n g f o c a l l e n g t h o f 100 c m . R e g a r d s .$

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Which of the following statements is true?
(a) A convex lens has 4 dioptre power having a focal length 0.25 m.
(b) A convex lens has -4 dioptre power having a focal length -0.25 m.
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(d) A concave lens has 4 dioptre power having a focal length -0.25 m.

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Define 1 Diopter Power of Lens

Dear Student,Dioptre is the unit of power of a lens.Power=1f⇒1D=110-2mTherefore,1D is the power of a lens having focal length of 100cm.Regards.

$D e a r S t u d e n t, D i o p t r e i s t h e u n i t o f p o w e r o f a l e n s . P o w e r = \frac{1}{f} \Rightarrow 1 D = \frac{1}{10^{- 2} m} T h e r e f o r e, 1 D i s t h e p o w e r o f a l e n s h a v i n g f o c a l l e n g t h o f 100 c m . R e g a r d s .$