# If a Glass Prism is Dipped in Water, Its Dispersive Power - Physics

MCQ
Fill in the Blanks

If a glass prism is dipped in water, its dispersive power ___________ .

#### Options

• increases

• decreases

• does not change

• may increase or decrease depending on whether the angle of the prism is less than or greater than 60°

#### Solution

Decreases

If μ is the refractive index and A is the angle of prism, then the angular dispersion produced by the prism will be given by $\delta = (\mu - 1)A.$

Because the relative refractive index of glass with respect to water is small compared to the refractive of glass with respect to air, the dispersive power of the glass prism is more in air than that in water.

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#### APPEARS IN

HC Verma Class 11, 12 Concepts of Physics 1
Chapter 20 Dispersion and Spectra
MCQ | Q 2 | Page 442