NCERT Exercise 9.1 — Q16 - Light — Reflection and Refraction
Question: Find the focal length of a lens of power -2.0 dioptres. What type of lens is this?
Answer: We are given the power of the lens P = -2.0 dioptres (or -2.0 D). To find the focal length (f), we use the relation between lens power and focal length, which is P = 1/f, where f is measured in met...
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