Magnifying power of simple microscope______________?
Correct answer: B. increase with decrease in focal length
- A. increase with increase in focal length
- B. increase with decrease in focal length
- C. no effect with decrease or increase with focal length
- D. list distance of distinct vision
Explanation
The magnifying power of a simple microscope is proportional to 1/f, so reducing the focal length increases magnification. This is why microscopes use a short-focal-length convex lens. Students often choose an increase with focal length because they confuse focal length with magnifying power.
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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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