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Diffraction gratings are often identified by the number of lines per centimeter; gratings with more lines per centimeter are usually more useful because **the greater the number of lines, the smaller the distance between the lines, and the greater the separation of images on the screen**.Hence, if the number of lines of a grating is increased, **its resolving power will also increase**.As the number of slits is increased, **the intensity of the principal maxima increases and the width decreases**.

Table of Contents

## What happens if we increase the number of lines in grating?

Hence, if the number of lines of a grating is increased, **its resolving power will also increase**.

## What happens when you increase the number of slits in a diffraction grating?

As the number of slits is increased, **the intensity of the principal maxima increases and the width decreases**.

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## What is the effect on diffraction pattern if the number of lines on the grating is decreased?

The principal maxima become more sharp and intense. Thus, a theoretical limit is reached the first order maximum will not be visible. If (a+b) <λ sinθ becomes greater than 1, which is not possible. Hence **no spectrum is formed and the grating is rendered useless**.

## What is the effect of increasing the number of slits in the diffraction grating on the intensity of the central maxima of the diffraction pattern?

On increasing the number of slots on the intensity of Central maxima of the diffraction pattern of a diffraction grating, **the intensity of central maxima will increase**. The grating intensity is proportional to the square of the number of slits illuminated.

## How the grating element is related with no of lines drawn per unit length of the grating?

**d = \frac {1} { N }, where N is the grating constant, and it is the number of lines per unit length**. Also, n is the order of grating, which is a positive integer, representing the repetition of the spectrum.

## Why does grating have large number of rulings?

Since the wavelength of visible light is very small ranging from 400 nm to 700 nm,so the diffraction grating have closely spaced rulings **in order to compare the size of the incident light**. A typical diffraction grating has about 400 to 5000 rulings per centimeter.

## Why does increasing the number of slits in a diffraction grating improve the resolution capabilities of that grating?

By using more slits, you get more destructive interference. The maxima on the other hand become much brighter because of **increased constructive interference**. This effectively increases the resolution of the experiment, making it easier to measure the distance between consecutive maxima.

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## How does the width of the slits affect the intensity in diffraction?

When the widths of the slits are greater than the wavelength of the light, the light casts the shadow. When the widths of the slits are narrow, light undergoes diffraction and the light waves overlap on the screen. Hence, **the intensity of the light is more as the width of the slit increases**.

## How does the width of the slits affect the interference pattern?

If we increase the width of the slit, what happens to the central maximum in the diffraction pattern? **It gets narrower**. This is true for single slits, double slits, and diffraction gratings. The smaller the object the wave interacts with, the more spread there is in the interference pattern.

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## What is the number of lines per mm of the diffraction grating?

A diffraction grating consists of many equally-spaced slits placed extremely close together, e.g., **300 lines per millimetre**. Light is diffracted through each slit, causing constructive and destructive interference.

## What is the distance between slits in diffraction grating?

Image 3 As light travels through the slit, it transmits through the diffraction grating at different angles θ. The distance between the grooves is ‘d’. If there are 1000 grooves per millimeter, and we want to know the distance between the grooves, we **divide the length (1 mm) by the number of grooves (1000)**.

## Will the angular separation between orders of Maxima increase or decrease with more lines per mm on the grating?

Grating equation

d = separation of slits θ = angle from zero order to nth maximum. λ and d must be in metres. , then it can be seen that to increase θ, the separation of the maxima, you can: increase the wavelength, i.e. move from blue towards red light **decrease the slit separation**, i.e. have more lines per mm.

## How does the number of lines slits in a diffraction grating affect the resolution of interference maxima?

Maxima can be produced at the same angles, but those for the diffraction grating are narrower and hence sharper. **The maxima become narrower and the regions between darker as the number of slits is increased**.

## What happens when you reduce increase the distance between the screen and diffraction grating?

What happens to the diffraction pattern when the distance between slits within the grating is increased? When the distance between slits within the grating is increased, **bands get closer together and eventually merge to form an image of the grating**.

## What is the relation of grating element with the number of rulings on the grating?

**Grating element is equal to the reciprocal of number of lines per cm on grating**. Let a train of plane waves be incident normally on grating. Considering light rays passing through the grating straight will be conveyed at ‘P’ As the wavelets through the various slits reach the point ‘p’ after covering equal distance.

## What are the factors on which diffraction in transmission grating depends?

The directions or diffraction angles of these beams depend on the wave (light) incident angle to the diffraction grating, the spacing or distance between adjacent diffracting elements (e.g., parallel slits for a transmission grating) on the grating, and the wavelength of the incident light.

## What is the maximum order for a grating?

2. Calculate the maximum number of orders visible with a diffraction grating of 500 lines per millimetre, using light of wavelength 600 nm. Therefore maximum number of orders = **3**, and a total of seven images of the source can be seen (three on each side of a central image).

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## Why is it that diffraction gratings are made with so many lines so close together?

**The more it can spread out the wavelengths (greater dispersion), the more detail can be seen in a spectrum**. This depends on the quality of the diffraction grating—it must be very precisely made in addition to having closely spaced lines.

## On what factors does the width of central maxima of a grating depend?

Therefore, the angular width of the central maximum depends upon **the frequency of the light** (since it depends upon the wavelength).

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