A student has a convex lens of focal length .

PHYSICS · Multi-part · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments

Problem

A student has a convex lens of focal length 4 cm4\,\text{cm}. (i) Calculate its magnifying power when the final image is at infinity. (ii) Calculate its magnifying power when the final image is at the near point (D=25 cmD=25\,\text{cm}). (iii) By what percentage does the magnifying power increase when the adjustment is changed from infinity to the near point?

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