An oil slick (n = 1.22) on water (n = 1.33) has a uniform thickness of 568 nm. It is illuminated by white light (400-700 nm) at normalincidence. In the reflected light, find the first wavelength that isa) enhancednmb) missingnm In a Young's double-slit experiment, the slits are 0.3 mm apart and are illuminated by laser light of wavelength 666.8nm. The screenis 2m away. What is the number of dark fringes per centimetre?

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An oil slick (n = 1.22) on water (n = 1.33) has a uniform thickness of 568 nm. It is illuminated by white light (400-700 nm) at normal incidence. In the reflected light, find the first wavelength that is a) enhanced nm b) missing nm