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Asked by prakriti12oct | 29 May, 2020, 02:09: AM
answered-by-expert Expert Answer
Dear user, it seems that some data is missing. 
Convex mirror has a virtual focus. Either some data is missing or question has been misprinted in the book. 
Answered by Shiwani Sawant | 29 May, 2020, 16:14: PM

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