NEET Physics (general) MCQ Question
Which of the following statements about magnification in optical instruments is correct?
The total magnification of a microscope increases when both the objective and eyepiece have larger focal lengths.
The angular magnification is greater when the final image is formed at infinity compared to when it is formed at the near point.
For a compound microscope, smaller focal lengths of the objective and eyepiece lead to larger magnification.
An erect image formed by a convex lens has a negative magnification value.
Correct Answer
Detailed Explanation
For a compound microscope, smaller focal lengths of the objective and eyepiece are essential to achieve a large magnification, as indicated in the context. Option A is incorrect as larger focal lengths decrease magnification. Option B is incorrect because the angular magnification decreases when the image is formed at infinity. Option D is incorrect since an erect image formed by a convex lens has a positive magnification value.
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