Kindly Answer This Question! ??
Thanksgiving in Advance ! ??

Dear student,
As the image is obtained on the screen , it is real .  so, 
Magnification , m = 3 ,  v = 80 cm  u = ?  As m = v/u  so, 3 = 80/u,  u = 80/3 cm . From  1/f = 1/v - 1/u  =1/80 + 3/80  = 4/80  = 1/20  1/f = 1/20cm so, f = 20 cm . 
The lens is convex and image formed at 80 cm from the lens is real and inverted.

Regards

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Here is the answer

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ThankYou !! (?????) @ShwetaJha
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