Wave Optics Ques 19
19. 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 :
[2020]
(a) $1.83 \times 10^{-7} rad$
(b) $7.32 \times 10^{-7} rad$
(c) $6.00 \times 10^{-7} rad$
(d) $3.66 \times 10^{-7} rad$
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Answer:
Correct Answer: 19.(d)
Solution:
- (d) Given:
Wavelength, $\lambda=600 nm=600 \times 10^{-9} m$
and diameter of objective, $d=2 m$
Limit of resolution of telescope,
$\theta=\frac{1.22 \lambda}{d}=\frac{1.22 \times 600 \times 10^{-9}}{2}=3.66 \times 10^{-7} rad$
BETA
