Question

Which one is the disadvantage of internal focusing telescope?

Answer 1

brightness of image is much reduced due to absorption of light

Answer 2

This telescope absorbs so much light in it due to which the brightness of the light is reduced.

Explanation:

• Internal focusing telescope is a photographic lens design to focus the image on the focus point by moving the group of the internal lens without shifting the front lens.
• It focues the light on th internal group of lens.
• Internal focusing telescope has many advantages and disadvantages.
• It absorbs so much light in it due to which the brightness of the light is reduced.