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Wave Optics
Question
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In Young's double slit experiment, three lights of blue, yellow and red colour are used successively. The fringe width will be maximum for which colour of light and why?

Answer

In visible spectrum, red light has the greatest wavelength. And, fringe width is directly proportional to the wavelength of light. Therefore, the fringe width will maximum for red light. 

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Some More Questions From Wave Optics Chapter

What is the shape of the wavefront in each of the following cases:
 Light emerging out of a convex lens when a point source is placed at its focus.

What is the shape of the wavefront in each of the following cases:
The portion of the wavefront of light from a distant star intercepted by the Earth. 

Is the speed of light in glass independent of the colour of light? If not, which of the two colours red and violet travels slower in a glass prism?