an object kept 60 cm from a lens gives a virtual image 20 cm ik n front of the lens. what is the focal length if the lens? it is a converging lens or diverging lens?
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Solve the problem by using lens formula:-
1/v-1/u=1/f
u will get f= 30cm
Which shows that the lens is converging..
shruti431:
plz tell me in deep
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