NCERT In-text 9.3.8 — Q3 - Light — Reflection and Refraction
Question: A doctor has prescribed a corrective lens of power -2.0 D. Identify the type of lens and its focal length.
Answer: To find the power of a concave lens with a focal length of 2 meters, we use the definition of lens power. The power of a lens (P) is the reciprocal of its focal length (f) in meters, expressed as P...
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