1. The second order fringe when 700 nm light falls on a doubleslit is
observed at a 15° angle to the initial beam direction. How farapart are
the slits? Ans: 5.41 x 10^-6 m
2. Light of frequency 6 x 10^14 Hz falls on a pair of slits thatare 0.0002 cm
apart. The center of the slits is 50 cm from the screen. How farfrom the
central bright line will the first order line appear? Ans: 0.13m
3. Monochromatic light falling on two slits 0.026 mm apartproduces the
fourth-order line at a 6.4°angle. What is the wavelength of lightused?
Ans: 7.25 x 10^-7 m
4. Light of wavelength 6.5 x 10^-5 cm passes through a singleslit and falls on
a screen 100 cm away. The third-order dark band is 0.25 cm fromthe
center of the pattern. What is the slit width? Ans: 7.8 x 10^- 4m
5. A diffraction grating with 760 lines per cm is used to form adiffraction
pattern. The first-order line is 3 cm from the central bright spot.The screen
is 80 cm away. What is the wavelength of light used? Ans: 4.93 x10^-7 m
6. At what angle will 710 nm light produce a third order maximumwhen
falling on a grating whose slits are 0.0017 cm apart? Ans: 7.2°
