Calculate the limit of resolution... | Wave Optics JEE Main 2019

JEE MAIN 2019

08-04-2019 S2

Question

Calculate the limit of resolution of a telescope objective having a diameter of 200 cm , if it has to detect light of wavelength 500 nm coming from a star.

Select the correct option:

$457.5 \times 10^{-9}$ radian

$305 \times 10^{-9}$ radian

$152.5 \times 10^{-9}$ radian

$610 \times 10^{-9}$ radian

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

$\begin{aligned} & \theta=\frac{1.22 \lambda}{D} \\ & \theta=\frac{1.22 \times 500 \times 10^{-9}}{200 \times 10^{-2}}=\frac{1.22 \times 500 \times 10^{-9}}{2} \\ & \theta=305 \times 10^{-9} \text { radian }\end{aligned}$

Question Tags

JEE Main

Physics

Medium

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