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In a compound microscope, the lens placed near the object has which property compared with the eye-piece lens?
AIt is a concave lens
BIt has the longer focal length
CIt has the larger aperture
DIt has the shorter focal length
Answer & Solution
Correct answer: D. It has the shorter focal length
1. A compound microscope uses two convex lenses, an objective and an eye-piece.
2. The objective sits near the object and has the shorter focal length.
3. The eye-piece, near the eye, has the larger focal length and larger aperture.
4. So the objective is the shorter-focal-length lens; the longer one is the eye-piece, ruling out that option.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 2 Optics "Microscope", p.33_
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