NEET 2002 Physics question
A bulb is located on a wall. Its image is to be obtained on a parallel wall with the help of convex lens. If the distance between parallel walls is 'd' then required focal length of lens placed in between the walls is :
Answer: (4)
Solution
A real image on a screen is formed by a convex lens only if the object-to-image distance (magnitudes) satisfies . With and one gets (magnitudes), whose roots are real only when , i.e. \le$
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