## How do you find the refractive index in Michelson interferometer?

Then, since the insertion of the glass plate increased the optical path length by 2(n–1)t, and the mirror motion decreased it by 2d, 2d must equal 2(n–1)t, so the refractive index n of the plate can be calculated from Nλ = 2d = 2(n–1)t.

How could the index of refraction of a gas be determined by means of the Michelson interferometer?

A Michelson interferometer can be used to determine the index of refraction of a gas. The gas is made to flow into an evacuated glass cell of length l placed in one arm of the interferometer. The interference fringes are counted as they move across the view aperture when the gas flows into the cell.

What is the principle of Michelson interferometer?

State the principle and describe the construction and working of Michelson Interferometer. Principle: It works on the principle of interference of light by the division of amplitude in light from an extended source is divided into two parts of equal intensity by partial reflection and refraction.

### How is index of refraction related to pressure?

For air and other ideal gases, the difference between the refractive index and 1 is proportional to the pressure of the gas. Thus we define the refractive index of air n = 1 + k p, where p is the air pressure and k is an unknown constant. When the pressure is changed, the change in the refraction index is ∆n = k ∆p.

Which lens is used in Michelson interferometer?

convex lens
In the lab, you will use a convex lens to disperse a laser light source. With a dispersed beam, the interferometer produces an interference pattern on the screen instead of a single point. Figure 3 shows the path of a dispersed laser beam at an exaggerated angle.

How a Michelson interferometer can be used for measuring distances?

The slits can be used as simple interferometer. If the distance between the slits is known, the wavelength of the light can be determined by measuring the distance of the maxima and minima. If the wavelength is known, the distance of the slits can be determined.

#### What is Michelson interferometer and its uses?

A Michelson interferometer is a tool used to produce interference between two beams of light. It is the most common design for optical interferometry and the first interferometer invented, by Albert Abraham Michelson in the late 19th century.

Why lens is used in Michelson interferometer?

In the lab, you will use a convex lens to disperse a laser light source. With a dispersed beam, the interferometer produces an interference pattern on the screen instead of a single point. Figure 3 shows the path of a dispersed laser beam at an exaggerated angle.

Why are fringes circular in Michelson interferometer?

Because interfering light waves have a spherical wavefront and it is projected on a plane surface. Hence the distance between the light source and the projected plane is shortest at the centre of the circular fringes and the path difference increases in every direction from the centre on the projected plane.

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