NEET2020Physics-Optics
NEET 2020 Physics Resolution of Telescopes MCQ Question
Type: MCQ-numerical-Easy-Class 12
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
7.32 × 10⁻⁷ rad
B
6.00 × 10⁻⁷ rad
C
3.66 × 10⁻⁷ rad
D
1.83 × 10⁻⁷ rad
Correct Answer
Option C
Detailed Explanation
The limit of resolution of a telescope is θ = 1.22λ/D. Here λ = 600 nm = 6 × 10⁻⁷ m and D = 2 m. θ = 1.22 × 6 × 10⁻⁷ / 2 = 3.66 × 10⁻⁷ rad. The dbAnswer incorrectly gave 7.32 × 10⁻⁷ rad (which omits dividing by 2). The correct answer is C.
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