Physics · 2016
JEE Main · 10 April 2016, Shift 1 · Q20
Two stars are 10 light years away from the earth. They are seen through a telescope of objective diameter 30 cm. The wavelength of light is 600 nm.…
Two stars are $\displaystyle 10$ light years away from the earth. They are seen through a telescope of objective diameter $\displaystyle 30$ cm. The wavelength of light is $\displaystyle 600$ nm. To see the stars just resolved by the telescope, the minimum distance between them should be ( $\displaystyle 1$ light year $\displaystyle =9.46 \times 10^{15} \mathrm{~m}$ ) of the order of :
Official answer
(2)
$\displaystyle 10^8 \mathrm{~km}$
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