Q1 . Light of wavelength 540 nm is diffracted by a grating ruled with 1000 lines/cm. There are a total of 2000 lines in the grating. Find the angular deviation of the third order image.
- 3.8°
- 9.3°
- 12.1°
- 18.9°
- none of above
Q 2. What is the maximum order which could be observed from the grating and light source in (2)? Choose the closest.
- 6th
- 9th
- 12th
- 15th
- 18th