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Q1. A single slit of width 0.05 mm is illuminated by the parallel light of wavelength 600 nm. How far is the sixth dark band from the central bright band as measured on the screen 20 cm from the slit?

a) 3.6 mm
b) 7.2 mm
c) 14.4 mm
d) 28.8 mm
e) None of above

Q2. Light of wavelength 540 nm is diffracted by the grating ruled with 1000 lines/cm. There are a total of 2000 lines in grating. find out the angular deviation of third order image.

a) 3.8°
b) 9.3°
c) 12.1°
d) 18.9°
e) None of the above

Q3. Illustrate the maximum order that could be observed from the grating and light source in (Q2)? Select the closest.

a) 6th
b) 9th
c) 12th
d) 15th
e) 18th

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