For a large magnification of a telescope, the focal length of the eyepiece (fe ) should be:
Correct answer: A. Small
- A. Small
- B. Infinity
- C. Large
- D. Of intermediate value
Explanation
A is the right option because To achieve a large magnification in a telescope, the focal length of the eyepiece (fe ) should be small. The magnification of a telescope is given by the ratio of the focal length of the telescope's objective (fo ) to the focal length of the eyepiece (fe ), and a smaller fe contributes to a larger 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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