NEET 2011 Physics question
A converging beam of rays is incident on a diverging lens. Having passed through the lens the rays intersect at a point from the lens on the opposite side. If the lens is removed the point where the rays meet will move closer to the lens. The focal length of the lens is :
Answer: (3)
Solution
Without the lens the converging beam would meet at a point behind the lens position (); this point acts as a virtual object for the lens, so with the sign convention (distances measured along the direction of the incident light as positive) . With the lens,
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