NEET2020PhysicsRay OpticsActual
Assume that light of wavelength 600   nm is coming from a star. The limit of resolution of telescope whose objective has a diameter of 2   m is:
Options
- A1 .83 × 10 − 7   rad
- B7.32 × 10 − 7   rad
- C6.00 × 10 − 7   rad
- D3.66 × 10 − 7   rad
Correct answer
D. 3.66 × 10 − 7   rad
Step-by-step solution
Limit of resolution of a telescope is given by, ϑ min = 1 . 22 λ a , where λ is the wavelength of the light and a is the aperture diameter. Given, λ = 600   nm   and   a = 2   m ϑ min = 1 . 22 × 6 × 10 − 7 2 ⇒ ϑ min = 3 . 66 × 10 − 7   rad