Two lines, A and B, of an X-ray beam give first order reflection maximum at a glancing angle of 30° and third order reflection maximum at an angle of 60° respectively from the face of the same crystal. If the wavelength of line B is 0.098 nm, then the wavelength of line A will be:

Two lines, A and B, of an X-ray beam give first order reflection maxim

1.	Two lines, A and B, of an X-ray beam give first order reflection maximum at a glancing angle of 30° and third order reflection maximum at an angle of 60° respectively from the face of the same crystal. If the wavelength of line B is 0.098 nm, then the wavelength of line A will be:
A.	0.170 nm
B.	0.056 nm
C.	0.126 nm
D.	0.092 nm
Answer» B. 0.056 nm