A Parallel Beam of Sodium Light of Wavelength 589 Nm $\times$

question 65

Multiple Choice

A parallel beam of sodium light of wavelength 589 nm is normally incident on a diffraction grating.If the second order diffraction maximum is observed at 50.25 degrees to the normal,then calculate the number of lines per cm of the grating.

• A)5.69 \(\times\) 10⁵ cm^-1
• B)1.53 \(\times\) 10⁶ cm^-1
• C)6.53 \(\times\) 10³ cm^-1
• D)1.31 \(\times\) 10⁶ cm^-1
• E)1.31 \(\times\) 10⁴ cm^-1

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