1. Tardigrade
  2. Question
  3. Physics
  4. Two convex lenses of focal lengths 0.3 m and 0.05 m are used to make a telescope. The distance kept between the two in order to obtain an image at infinity is

Q. Two convex lenses of focal lengths and are used to make a telescope. The distance kept between the two in order to obtain an image at infinity is

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Solution:

When the final image is formed at infinity by a telescope, it is called in normal adjustment and then the length of the telescope is given by

Where is the focal length of the objective lens and is the focal length of eye-piece