NCERT Exercise 9.1 — Q17 - Light — Reflection and Refraction
Question: A doctor has prescribed a corrective lens of power +1.5 D. Identify the type of lens and the defect of vision it corrects. Find the focal length of the lens.
Answer: We are given the power of the prescribed corrective lens P = +1.5 dioptres (or +1.5 D). To find the focal length (f) of the lens, we use the formula P = 1/f, where f is in meters. Rearranging this ...
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