Concepts Of Physics MCQ Edition [Volume 1]PhysicsDispersion and Spectra

When a glass prism is immersed in water, its dispersive power

Options

Aincreases
Bremains unchanged
Cdecreases
Dmay increase or decrease depending on whether the prism angle is less than or greater than 60^

Correct answer

A. increases

Step-by-step solution

The dispersive power of a glass prism in air is given by: = _v - _r _y - 1 where _v , _r , and _y are the refractive indices of glass for violet, red, and yellow (mean) light, respectively. When the prism is immersed in water, the relative refractive index of glass with respect to water is considered. Assuming the refractive index of water _w is approximately constant for all colors (ignoring the dispersion of water), the relative refractive indices are: '_v = _v _w , '_r = _r _w , and '_y = _y _w The new dispersiv

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