Haryana Gram Sachiv 9 Jan 2021 Shift 1 Paper

Question : 24 of 90

Marks: +1, -0

A slit of width 'a' is illuminated by white light. For what value of 'a' will the first minimum for red light of wavelength 650 nm be at θ = 15° ? (Given sin 15° = 0.2588)