Q63 / 90 · JEE Main 2023 (08 Apr Shift 1) · Physics

In a reflecting telescope, a secondary mirror is used to:

  • A
    reduce the problem of mechanical support
  • B
    make chromatic aberration zero
  • Correct answer
    C
    move the eyepiece outside the telescopic tube
  • D
    remove spherical aberration

Solution

Mirrors are used in reflecting telescopes, which allow astronomers to see distant objects in space more clearly.

A mirror forms an image by gathering light from spatial objects. A second mirror receives the picture that was reflected by the first mirror, which may be rather wide. The light is reflected by this tiny mirror onto an eyepiece lens, which magnifies or enlarges the image of the object.

Hence, the secondary mirror is used to move the eyepiece outside the telescopic tube.

Hence, the correct answer is option: 'C'.

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