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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.Increasing the number of slits **makes the diffraction maximum sharper**.

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 impact of increasing number of slits on diffraction pattern?

Increasing the number of slits **makes the diffraction maximum sharper**.

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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**.

## What is the effect of having many slits or rulings in a diffraction grating?

A diffraction grating consists of a large number of evenly spaced parallel slits that **produce an interference pattern similar to but sharper than that of a double slit**.

## 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 do the lines on the diffraction grating represent?

Gratings give exceptionally high resolutions of **spectral lines**. The resolving power (R) of an optical instrument represents the ability to separate closely spaced lines in a spectrum and is equal to the wavelength λ divided by the smallest difference (Δλ) in two wavelengths that can be detected; i.e., R = λ/Δλ.

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

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## What happens to the interference pattern if D is increased?

**More interference occurs when d is wider**. The spacings between different fringes decreases as the distance between the slits increases because it is dependent on L. Increasing the wavelength of the light increases the spacing between different fringes since the spacing between different fringes is wavelength dependent.

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## 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 the size of the grating element is increased?

∴ resolving power ∝ number of grating lines

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

## 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 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.

## How many slits are in a diffraction grating?

The number of slits per metre on the grating, **N = 1/ d where d is the grating spacing**. For a given order and wavelength, the smaller the value of d, the greater the angle of diffraction. In other words, the larger the number of slits per metre, the bigger the angle of diffraction.

## 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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## 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 = ° .

## Why does the diffraction grating produces a pattern of Coloured bands?

**The narrow, closely spaced grooves in the disc diffract the reflected light and produce the interference pattern that separates light into colors**.

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