NCERT Exercise 9.1 — Q11 - Light — Reflection and Refraction
Question: A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object from the lens? Draw the ray diagram.
Answer: We are given that the focal length of the concave lens is f = -15 cm, and the image distance is v = -10 cm. The image distance is negative because a concave lens always forms a virtual, erect image...
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