Question

what changes are observed in diffraction pattern if the whole apparatus is immersed in water?

Answer 1

Explanation:

As the whole apparatus is now immersed in water, the wavelength of the light will change. Therefore, as the refractive index of water is greater than the air, the wavelength of light will decrease.

Answer 2

The changes that are observed in diffraction pattern if the whole apparatus is immersed in water are as follows:

• The refractive index of the water growing shorter would modify the wavelength of the light. The wavelength of light will drop as the refractive index of water exceeds that of air.
• In terms of how many wavelengths away the imaging plane is from the slit, the nominal distance from the slit to the imaging plane would likewise shift that is the width of the central maxima also decreases.