Question

Vv, Vr, Vg are the velocities of violet, red and green respectively, passing through a prism after dispersion of white light. Which among the following is a correct relation? a. Vv=Vr=Vg b.Vv<Vg<Vr c. Vv>Vr>Vg d. Vv<Vr<Vg​

Answer 1

Answer:

Explanation:

In VIBGYOR, as the full spectrum of visible light travels through a prism, the wavelengths are separated into the colors of the rainbow because each color has different wavelength. Violet has the shortest wavelength, at 380 nanometers, while red has the longest wavelength, of around 700 nanometers.

Thus, Violet light is deviated the most and the red light is deviated the least. In the spectrum, the deviation always decreases from Violet to red.

As a result the Speed of different colors in VIBGYOR decreases from violet and becomes maximum at Red. Thus, if Vr is max. then will come Vg and then Vg.

Therefore, the correct sequence will be, Vv < Vg <Vr.

Answer 2

Answer:

The correct relation is b) Vv < Vg < Vr.

Explanation:

In VIBGYOR, as the full spectrum of ‘visible light’ travels through a prism, the wavelengths are separated into the ‘colors of the rainbow’ because each color has ‘different wavelength’.  

Violet has the ‘shortest wavelength’, at 380 nanometers while red has the ‘longest wavelength’ of around 700 nanometers. In the spectrum, the deviation always decreases from violet to red.

As a result, the speed of different colors in VIBGYOR decreases from violet and becomes maximum at red. Thus, if Vr is max then Vv is small. So the correct sequence is Vv < Vg < Vr.