1 sec of arc will correspond to how much rise or fall in surface, whe – 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? (λ is the distance between centres of feet)
A.	0.000006λ
B.	0.00006λ
C.	0.00006λ
D.	0.0006λ
Answer» B. 0.00006λ

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