JEE Main 2016PhysicsWave OpticsMediumMCQ

JEE Main 2016 — Wave Optics Question with Solution

JEE Main 2016 (10 Apr Online)

Question

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 600nm. To see the stars just resolved by the telescope, the minimum distance between them should be 1 light year=9.46×1015m of the order of :

Choose an option

Show full solutionCorrect option: A
Correct answer
A108km

Step-by-step explanation

l=Ra1.22×λ

and  a = 30 cm

⇒l=9.46×1015×10×1.22×600×10-90.3

=2.30×1011m

⇒   2.30×108 km

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About this question

This is a previous-year question from JEE Main 2016, covering the Wave Optics chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.