For large magnification of a telescope:
Correct answer: B. Both (a) and (c)
- A. fo increases
- B. Both (a) and (c)
- C. fe decreases
- D. No change in fo and fe
Explanation
The correct option is B because For a large magnification of a telescope, both the focal length of the objective (fo ) and the focal length of the eyepiece (fe ) need to be adjusted. Increasing fo and decreasing fe will contribute to achieving higher magnification.
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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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