Deflection angle of a ray grazing the sun

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I saw in a website that Einstein found the deflection angle of a ray grazing the sun through this relation
alpha=4GM/c2r=1.74 arc sec
but when i used this relation by giving values i didnt get this value 1.74...wats wrong..can anyone solve this ...
 

Answers and Replies

213
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I got the answer 1.74...i multipled the answer by 206264 to convert it into arcsecs..
can anyone tell me how to derive this alpha...alpha=4GM/c2r
 
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