Physics (AS & A Level) · May / June 2022 · Paper 22 · Question 5

Light from a laser is used to produce an interference pattern on a screen, as shown in Fig. 5.1. light of wavelength 660 nm O P Q R 0.44 mm 1.8 m double slit screen central bright fringe dark fringe bright fringe dark fringe Fig. 5.1 (not to scale) The light of wavelength 660 nm is incident normally on two slits that have a separation of 0.44 mm. The double slit is parallel to the screen. The perpendicular distance between the double slit and the screen is 1.8 m. The central bright fringe on the screen is formed at point O. The next dark fringe below point O is formed at point P. The next bright fringe and the next dark fringe below point P are formed at points Q and R respectively.

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