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Find the distance of a dark band from the central bright band.

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

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

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

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

3. What is the maximum order which could be observed from the grating and light source in (2)? Select the closest.

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

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