chhattisgarh board-2018

The ratio of the dimensions of two light sources is $4:1$. After the interference what will be the ratio of maximum and minimum intensities?

Derive the expression for the fringe width in Young's double slit experiment.

Obtain an expression for width of central maxima by diffraction of light at a single slit.

Which waves between heat waves and sound waves can be polarised? 

"Only white and dark fringes are obtained when white light is used in Young's double slit experiment.” Is this statement true? Justify. 

Write the two differences between Fresnel and Fraunhofer diffraction.