1. 3.66×10⁻⁷ rad 2. 1.83×10⁻⁷ rad 3. 7.32×10⁻⁷ rad 4. 6.00×10⁻⁷ rad

Answer: 1. 3.66×10⁻⁷ rad Limit of resolution of a telescope: Δθ=1.22λ/D . Δθ=frac1.22×600×10⁻⁹2=3.66×10⁻⁷\ rad Answer: option 1.

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 :

1. $3.66\times10^{-7}$ rad

2. $1.83\times10^{-7}$ rad

3. $7.32\times10^{-7}$ rad

4. $6.00\times10^{-7}$ rad

Doubtly Asked 30 Oct 2026 NEET UG 2020 neet Save WhatsApp Report

Best answer

Answer: 1. $3.66\times10^{-7}$ rad

Limit of resolution of a telescope: $\Delta\theta=\dfrac{1.22\lambda}{D}$.

$$\Delta\theta=\frac{1.22\times600\times10^{-9}}{2}=3.66\times10^{-7}\ \text{rad}$$

Answer: option 1.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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