Q. The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 Å is of the order of :
A) 10⁶ rad
B) 10⁻⁴ rad
C) 10⁴ rad
D) 10⁻⁶ rad
Explanation
[Solution from source] Limit of resolution θ ≈ 1.22λ/D = 1.22 × 5 × 10⁻⁷/0.1 ≈ 6 × 10⁻⁶ rad, i.e. of the order of 10⁻⁶ rad. 10⁻⁴ rad would need a 1 mm aperture. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.