A telescope is used to resolve two stars separated by `4.6xx10^(-6)` rad. If the wavelength of light used is `5460 Å` , what should be the aperture of the objective of the telescope ?
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Here, `dphi = 4.6 xx 10^(-6) rad`, `lambda = 5460 Å = 546 xx 10^(-9) m` `D = ?` As `dphi = (1.22 lambda)/(D)` `:. D = (1.22 lambda)/(dphi) = (1.22 xx 546 xx 10^(-9))/(4.6 xx 10^(-6)) = 0.1488 m`
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