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Light Reflection and Refraction
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23/08/2021 8:17 pm
Topic starter
The optician’s prescription for a spectacle lens is marked +0.5 D. What is the :
(a) nature of spectacle lens?
(b) focal length of spectacle lens?
1 Answer
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23/08/2021 8:18 pm
(a) Convex lens
(b) P = +0.5 D
P = \(\frac{1}{f}\)
f = \(\frac{1}{P}\) = \(\frac{1}{0.5}\)
= 2 m