# What is the relation between deviation and refractive index?

## What is the relation between deviation and refractive index?

The deviation angle in a prism depends upon: Refractive index of the prism: The refractive index depends on the material and the wavelength of the light. The larger the refractive index, the larger the deviation angle. Angle of the prism: The larger the prism angle, the larger the deviation angle.

### What is the dispersive power of prism?

Answer: Dispersive power of prism is defined as the measure of the difference in refraction of the light of the highest wavelength and the lowest wavelength that enters the prism. The dispersive power of the prism can also be expressed in terms of the angle between the two extreme wavelengths.

#### What is minimum deviation of prism?

The smallest angle through which light is bent by an optical element or system. In a prism, the angle of deviation is a minimum if the incident and exiting rays form equal angles with the prism faces. The angle is important relative to prism spectroscopes because it can be easily determined.

**What is prism formula?**

The formula for the volume of a prism is V=Bh , where B is the base area and h is the height. The base of the prism is a rectangle. The length of the rectangle is 9 cm and the width is 7 cm. The area A of a rectangle with length l and width w is A=lw . So, the base area is 9×7 or 63 cm2 .

**What is the relationship between refractive index and angle of minimum deviation?**

The refractive index of glass is 1.5. The minimum angle of deviation for an equilateral prism along with the corresponding angle of incidence is desired. If the minimum angle of deviation of a prism of refractive index 1.4 equals its refracting angle, the angle of the prism is desired.

## How does angle of deviation depends on refractive index?

This angle is what we call the angle of deviation. Since the angle of deviation is calculated using the angle of incidence ray, the angle of deviation depends on the angle of incidence. The Refractive index of the prism is the ratio of the speed of light in a vacuum divided by the velocity of light in the medium.

### What is dispersive power formula?

Formula for dispersive power is (where symbols have their usual meanings) or. If the refractive indices of crown glass for red, yellow, and violet colours are respectively μr. , then the dispersive power of this glass would be. A. μv−μyμr−1.

#### What is the dispersive power definition?

: the power of a transparent medium to separate different colors of light by refraction as measured by the difference in refractivity for two specified widely differing wavelengths divided by the refractivity at some specified intermediate wavelength.

**What is minimum deviation simple?**

A method for measuring the refractive index of a prism or a liquid in a hollow prism by determining the minimum deflected angle of a light beam.

**What do you mean by angle of minimum deviation of prism?**

Angle of minimum deviation is the minimum angle at which the angle of incidence will be equal to the angle of emergence and the refracted ray will be parallel to the base of the prism.

## How to calculate the refractive index of a prism?

The refractive index of the material of the prism is given by, μ = [sin (A + D)/2]/ sin A/2; where A is the angle and D is the angle of minimum deviation of the prism. (xi) Procedure to find the angle of the prism (A) A drawing paper is fixed on a horizontal drawing board. The outline ABC of the prism is drawn on the paper.

### How is the refractive index of glass different for different colour of light?

Hence the refractive index n of a material is different for different colour of light. In glass, the speed of violet light is minimum while that of red light is maximum. Therefore, the refractive index of glass is maximum for the violet light and minimum for the red light (n

#### When is a ray reflected by a prism?

Ans: If the angle of incidence in a denser medium is greater than the critical angle the ray is reflected internally. This is known as total internal reflection. (ii) To study the variation of the angle of deviation (d) with the angle of incidence (i) and hence to determine the angle of minimum deviation of the prism by drawing i – d curve.

**What is the critical angle of a prism?**

Ans. When refraction takes place from a denser to a rare medium, that angle of incidence for which the angle of refraction is 90 o, is called the critical angle. Q.21: What is totally reflecting prism?