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किसी तारे से `6000Å` का प्रकाश आ रहा है। किसी दूरदर्शी के विभेदन की सीमा क्या होगी यदि उससे अभिदृश्यक का व्यास 100 इंच है?

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दूरदर्शी की विभेदन सीमा `d theta=(1.22lambda)/(a)`
जहाँ `a=100` इंच = 254 सेमी., `lambda=6xx10^(-5)` सेमी.
`therefore" " d theta=(1.22xx6xx10^(-5))/(254)`
`=2.9xx10^(-7)"rad."`

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