JEE PYQ: Wave Optics Question 27
Question 27 - 2019 (09 Apr Shift 2)
Diameter of the objective lens of a telescope is 250 cm. For light of wavelength 600 nm. Coming from a distant object, the limit of resolution of the telescope is close to:
(1) $1.5 \times 10^{-7}$ rad
(2) $2.0 \times 10^{-7}$ rad
(3) $3.0 \times 10^{-7}$ rad
(4) $4.5 \times 10^{-7}$ rad
Show Answer
Answer: (3)
Solution
$\theta = \frac{1.22\lambda}{d} = \frac{1.22 \times 600 \times 10^{-9}}{250 \times 10^{-2}}$
$= 3.0 \times 10^{-7}$ rad
BETA
