Question
In a reflecting telescope, a secondary mirror is used to:
BITSAT
Physics
Ray Optics
2023
BITSAT 2023 (Memory Based Paper 1)
BITSAT Physics Question (2023) — Solution
Options
- A. reduce the problem of mechanical support
- B. remove spherical aberration
- C. make chromatic aberration zero
- D. move the eyepiece outside the telescopic tube
Answer
D. move the eyepiece outside the telescopic tube
Step-by-step solution
(d) To redirect the light that enters the telescope to the eyepiece or camera. The primary mirror of a reflecting telescopes gathers the light and reflects towards the secondary mirror which then reflect the light towards the eyepiece allowing the observer to see image. It has advantage of a large focal length in a short telescope.
Related: Physics — Ray Optics · All PYQ Banks