In compound microscope, the focal length of objective is
Correct answer: B. Small
- A. Large
- B. Small
- C. Both A and B
- D. None of these
Explanation
The objective lens in a compound microscope is designed to have a small focal length. This is essential for achieving high magnification necessary to view tiny details of the specimen. A smaller focal length allows the lens to bend light more sharply, creating a larger image of the specimen. Option A, stating the focal length is large, is incorrect because a large focal length would result in lower magnification. Option C is incorrect as it contradicts itself, and Option D is incorrect because Option B correctly describes the focal length required for an objective lens in a compound microscope.
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Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
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