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A telescope with objective diameter R is used to observe a distant star emitting light of wavelength 500 nm, at a resolution of 5 10-7 radian. The value of R is cm.
(2) 122
Limit of resolution of a telescope: = 1.22 D (D = diameter of the objective, here R)
⇒ R= 1.22 = 1.22 500 10-95 10-7
⇒ R=1.22 m=122 cm
Answer: (2)
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