Length of the telescope is:
Correct answer: C. The distance between the objective and eyepiece
- A. The distance between the objective and focal point of eyepiece
- B. The distance between the object and final image
- C. The distance between the objective and eyepiece
- D. The distance between the focal point of objective and eyepiece
- E. The distance between the eyepiece and final image
Explanation
The length of the telescope is also termed as focal length. Generally expressed, the focal length is the distance (given in millimeters) between the telescope's primary lens(objective) or mirror and the point where the light rays come together in focus(eyepiece).
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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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