A student can distinctly see the object up to a distance 15 cm. He wan – InterviewSolution

1.	A student can distinctly see the object up to a distance 15 cm. He wants to see the black board at a distance of 3 m. Focal length and power of lens used respectively will be-
Answer» A student can distinctly see the object up to a distance $15 cm .$ He wants to see the black board at a distance of $3 m .$ Focal length and power of lens used respectively will be-

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