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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**.Advantages of increasing the number of lines in the grating are: a **The number of principle maxima that can be seen on a screen increase**. b The distance between two adjacent principle maxima increases.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.

Table of Contents

## What is the advantage of increasing the number of lines in grating?

Advantages of increasing the number of lines in the grating are: a **The number of principle maxima that can be seen on a screen increase**. b The distance between two adjacent principle maxima increases.

## 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.

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## What happens when you increase the number of slits?

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

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

**As the number of slits is increased, the width of the maxima decreases** (and they get brighter).

## What is the effect of increasing the number of lines cm of the grating on the order of the spectrum?

n = order of spectrum, N = total no. of lines in the given grating. Hence, if the number of lines of a grating is increased, **its resolving power will also increase**.

## How do you determine the number of lines in a diffraction 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.

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

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**.

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Increasing the number of slits not only makes the diffraction maximum sharper, but also much more intense. If a 1 mm diameter laser beam strikes a 600 line/mm …

### What will happen if we increase or decrease the grating value?

What is the effect of increasing the number of lines on the grating? If we increase the number of lines of grating, correspondingly the grating element (a+b) …

## How does increasing number of slits affect the interference pattern?

Increasing the number of slits **increases the number of angles at which destructive (or almost destructive) interference can occur**, while the condition for constructive interference remains just the same (nλ=d sinθ for a transmission grating at normal incidence).

## 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.

## What happens to diffraction pattern when distance between slits within the grating is increased?

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**.

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## How does increase the number of slits in a diffraction grating?

Increasing the number of slits not only **makes the diffraction maximum sharper, but also much more intense**. If a 1 mm diameter laser beam strikes a 600 line/mm grating, then it covers 600 slits and the resulting line intensity is 90,000 x that of a double slit.

## 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.

## What will happen if no of lines per cm is increased?

What happens to the diffraction pattern when the number of lines per centimeter of a diffraction grating is increased? A. **Nothing happens to the diffraction pattern**.

## What is the separation between the lines of the diffraction grating?

For a diffraction grating with lines/mm = lines/inch, the slit separation is **d = micrometers = x10^ m.** **= cm**. This corresponds to an angle of θ = ° .

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

It is obtained by ruling equidistant parallel lines on a glass plate with the help of a fine diamond point. Grating element: Let N be the number of parallel slits, each of width ‘a’ and separated by opaque space ‘b’. Then, the distance between the centers of the adjacent slits is **d=a+b** and is known as grating element.

## What does diffraction grating do?

A diffraction grating is an optical element, which **separates (disperses) polychromatic light into its constituent wavelengths (colors)**. The polychromatic light incident on the grating is dispersed so that each wavelength is reflected from the grating at a slightly different angle.

## What is the purpose of the diffraction grating?

A diffraction grating is able to **disperse a beam of various wavelengths into a spectrum of associated lines** because of the principle of diffraction: in any particular direction, only those waves of a given wavelength will be conserved, all the rest being destroyed because of interference with one another.

## Which of the following will result if the number of lines in a diffraction grating of a given width is increased?

i) with the increase in number of lines **the secondary maxima relative to the principal maxima decreases and becomes negligible**. The principal maxima become more sharp and intense. Thus, a theoretical limit is reached the first order maximum will not be visible.

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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**.

## What will be the effect on fringe width when distance between slits become doubled?

EXPLANATION: The fringe width is inversely proportional to the distance between the slits. When the distance between the slit is doubled **the fringe width becomes half**.

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