Question 10: NCERT Solutions for 12th Class Physics: Chapter 9-Ray Optics and Optical Instruments
What is the focal length of a convex lens of focal length 30 cm in contact with a concave lens of focal length 20 cm? Is the system a converging or a diverging lens? Ignore thickness of the lenses.
Equivalent focal length of the combination
Hence, system will behave as a diverging lens of focal length 60 cm.
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NCERT Solutions for 12th Class Physics: Chapter 9-Ray Optics and Optical Instruments