Question

a student has obtained an image of a object on a screen to determine the focal length f1 of the given lens. his teacher after checking the image have him another Lens of focal length f2 and asked to focus the same object on the screen. The student found that to obtain a sharp image he has to mobe the lens away from the screen .From this finding we may conclude that both the lens given to the student were 1) concave and f1<f2
2)convex and f1 <f2
3)convex and f1>f2
4) concave and f1 >f2​

Answer 1

Explanation:

3)answer convex lens f1←f2

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