1 sec of arc will correspond to how much rise or fall in surface, when – McqOptions

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1.	1 sec of arc will correspond to how much rise or fall in surface, when surface straightness is tested by autocollimator? (‚âà√≠¬¨‚Ñ¢ is the distance between centres of feet)$
A.	0.000006‚âà√≠¬¨‚Ñ¢
B.	0.00006‚âà√≠¬¨‚Ñ¢
C.	0.00006‚âà√≠¬¨‚Ñ¢
D.	0.0006‚âà√≠¬¨‚Ñ¢
Answer» B. 0.00006‚âà√≠¬¨‚Ñ¢

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