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Assume that light of wavelength 5000 Å is coming from a star. What is the limit of resolution of a telescope whose objective

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Assume that light of wavelength 5000 Å is coming from a star. What is the limit of resolution of a telescope whose objective has a diameter of 5.08 m ? 

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Given wavelength of light = 5000 A, = 5 x 10-7 m, 

Diameter of the objective = 5.08 m. 

Limit of resolution: Δθ = 1.22λ/2a 

= (1.22 x 5 x 10-7m / 5.08) = 1.2 x 10-7 radians.  

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