Q. 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 :
A) $1.83 \times 10^{-7}$ rad
B) $7.32 \times 10^{-7}$ rad
C) $6.00 \times 10^{-7}$ rad
D) $3.66 \times 10^{-7}$ rad
Explanation
[Solution] $\theta = \frac{1.22\lambda}{D} = \frac{1.22 \times 600 \times 10^{-9}}{2} = 3.66 \times 10^{-7}$ rad. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.