NEET Physics Lenses MCQ Question
Consider a system of two lenses in contact: a convex lens with a focal length of 10 cm and a concave lens with a focal length of 15 cm. If the combined lens system is placed in air, what is the effective focal length of this combination?
6 cm
30 cm
50 cm
Negative infinity
Correct Answer
Detailed Explanation
The effective focal length of a combination of lenses in contact is given by the formula . Substituting the values, , leading to an effective focal length of 6 cm.
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