Which type of light source is used in N.P.L. type of flatness interfer

1.	Which type of light source is used in N.P.L. type of flatness interferometer?
A.	Mercury vapour lamp
B.	Cadmium lamp
C.	Both a. and b.
D.	None of the above
Answer» B. Cadmium lamp

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Which type of light source is used in N.P.L. type of flatness interferometer?

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