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

## What is the advantage of having many slits in a diffraction 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.

### Advantages of increasing number of lines on grating

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## What is the purpose of lines in diffraction grating?

diffraction grating, component of optical devices consisting of a surface ruled with close, equidistant, and parallel lines for the purpose of **resolving light into spectra**.

## Why a diffraction grating having 20000 lines per inch is better than that having 15000 lines per inch?

A diffraction grating is the number of lines per unit length. where N is no of lines. **d is inversely proportional to N**. ∴ A diffraction grating having 20000 lines per inch is better than that having 15000 lines per inch.

## 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).

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

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

## 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.

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## 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 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 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).

### Calculate maximum order of diffraction in diffraction grating

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## Which of the following will exhibit the greatest amount of diffraction?

The correct option is C **radio waves**. Explanation:Maximum diffraction occurs when size of obstacle is almost equal to wavelength of light wave. Hence maximum diffraction occurs for larger wavelength . As wavelength of radio wave is higher than others maximum diffraction will occur for it.

## 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**.

## What will happen to the observed spectrum if 90% of the ruled width of the grating is covered?

**The tilted grating will behave as if it has a smaller grating space**. This could indeed be useful, to get higher dispersion. Orders on one side of the zeroth order would have reduced brightness, orders on the other side would be brighter.

## 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**.

## What happens to the diffraction pattern when the number of slits within the grating is reduced?

So in a diffraction grating set up if the number of number of slits being used is reduced, say half the grating is covered up with black paper, **the interference pattern would become less bright** and the width of the principal maxima would increase.

## What is the advantage of using a diffraction grating rather than a double slit for dispersing light into a spectrum?

1. The diffraction gratings **form a sharper pattern** than the double slit.

## How can the resolving power of diffraction grating be improved?

How will you increase the resolving power of a diffraction grating? Thus a grating with high resolving power can distinguish between small differences in wavelength. Thus by **increasing the number of slits**, we can increase the resolving power of the diffraction grating.

## 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.

### 27.28 | What is the maximum number of lines per centimeter a diffraction grating can have and

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## What is grating spacing?

For a diffraction grating, the relationship between the grating spacing (i.e., **the distance between adjacent grating grooves or slits**), the angle of the wave (light) incidence to the grating, and the diffracted wave from the grating, is known as the grating equation.

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

The condition for maximum intensity is the same as that for a double slit. However, angular separation of the maxima is generally much greater because the slit spacing is so small for a diffraction grating. For a diffraction grating with lines/mm = lines/inch, the slit separation is **d = micrometers = x10^ m**.

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