JEE Advanced Model Paper 17 with solutions for online practice

A certain crude oil has an index of refraction of 1.25. A ship dumps 1m3 of this oil into theocean and oil spreads into a thin uniform film on water surface (µ=

4

3

) . When light ofwavelength 500 nm is incident on it, the reflected light shows maxima. What is the area (in km2) covered by the spilled oil? Assume that the thickness of film is minimum requiredto satisfy this criterion.