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Dear student,
refer to the link below for the answer to a similar query,
https://www.meritnation.com/ask-answer/question/3-one-half-of-a-convex-lens-of-focal-length-20-cm-covere/light-reflection-and-refraction/8717407
Regards
refer to the link below for the answer to a similar query,
https://www.meritnation.com/ask-answer/question/3-one-half-of-a-convex-lens-of-focal-length-20-cm-covere/light-reflection-and-refraction/8717407
Regards