NEET Physics Lenses MCQ Question
Which of the following statements about lenses and their combinations is correct?
The effective focal length of two lenses in contact is the sum of their individual focal lengths.
A combination of a convex lens and a concave lens can only produce a diverging lens.
The magnifying power of a lens system is always greater than that of the individual lenses.
The net power of a combination of lenses is the algebraic sum of the individual powers, accounting for their types.
Correct Answer
Detailed Explanation
The effective focal length of two lenses in contact is given by the formula 1/f = 1/f1 + 1/f2, meaning it is not simply the sum of their individual focal lengths (option A is incorrect). A combination can yield both converging and diverging effects depending on the focal lengths (option B is incorrect). The magnifying power can vary based on the arrangement and focal lengths (option C is incorrect). The net power is indeed the algebraic sum of the individual powers (option D is correct).
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