NEET Physics Lenses MCQ Question
Consider a scenario with two thin lenses, Lens A with a focal length of f1 and Lens B with a focal length of f2, placed in contact with each other along the same principal axis. If the lenses are combined, which of the following expressions correctly represents the effective focal length (F) of the lens combination?
F = (f1 + f2) / 2
1/F = 1/f1 + 1/f2
F = f1 * f2 / (f1 + f2)
F = f1 - f2
Correct Answer
Detailed Explanation
The effective focal length of a combination of thin lenses in contact is given by 1/F = 1/f1 + 1/f2, where f1 and f2 are the focal lengths of the individual lenses. This is derived from the lens formula.
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