(a) What is the dispersion of white light? What is the cause of such dispersion? Draw a diagram to show the dispersion of white light by a glass prism.
(b) A glass prism is able to produce a spectrum when white light passes through it but
a glass slab does not produce any spectrum. Explain why is it so?
Answers
Explanation:
Dispersion
The splitting of white light into it's constituent colors
Cause of dispersion:
Light rays of different colors travel at same speed in vaccum and air but in other medium it travel at different speed and bend at different angle which leads to the dispersion of light
Red light has the maximum wavelength where as Violet light has the minimum wave length. So in any medium red light travels the fastest and deviates the least while Violet light travels the slowest and deviates the maximum
MORE TO KNOW: wavelength is directly proportional to velocity and inversely proportional to deviation
b) In a glass slab, the opposite sides are parallel and therefore different colors emerge parallel to each other and are seen simultaneously. Therefore, dispersion doesn't occur in a glass slab
Hope this helps u!