PhysicsJEE Main 4 Apr 2026, Shift 1·Q19·MCQ·Easy–moderate

Ray Optics · Optical instruments

A telescope with objective diameter

R

is used to observe a distant star emitting light of wavelength 500 nm, at a resolution of

5\times10^{-7}

radian. The value of

R

is cm.

(1)61
(2)122
(3)244
(4)305

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