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If a spherical lens has a power of, −0.25 D, the focal length of this lens will be : (a) −4 cm (b) −400 mm (c) −4 m (d) −40 cm - CBSE Class 10 - Science

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Question

If a spherical lens has a power of, −0.25 D, the focal length of this lens will be :
(a) −4 cm
(b) −400 mm
(c) −4 m
(d) −40 cm

Solution

-4 m

Focal length =`1/"power"=1/0.25=-100/25=-4m` 

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Solution If a spherical lens has a power of, −0.25 D, the focal length of this lens will be : (a) −4 cm (b) −400 mm (c) −4 m (d) −40 cm Concept: Refraction of Light - Refraction by Spherical Lenses.
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