# Tips and Tricks for Diffraction Grating Viva Questions: Download the PDF for Free

## Viva Questions On Diffraction Grating Pdf Download

If you are looking for viva questions on diffraction grating pdf download, you have come to the right place. In this article, we will provide you with some of the most common and important viva questions on diffraction grating along with their answers and explanations. We will also give you some tips and tricks on how to prepare for the viva exam and ace the diffraction grating experiment.

## Viva Questions On Diffraction Grating Pdf Download

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## What is Diffraction Grating?

A diffraction grating is a device that consists of a large number of parallel and equidistant slits or lines on a transparent or reflective surface. When a beam of monochromatic or white light falls on the grating, it splits into several beams of different wavelengths or colors due to the phenomenon of diffraction. The diffracted beams interfere with each other to form a spectrum of light on a screen or a detector.

## What are the Types of Diffraction Grating?

There are two main types of diffraction grating: transmission grating and reflection grating. A transmission grating is made of a transparent material such as glass or plastic with slits or lines etched or ruled on it. A reflection grating is made of a reflective material such as metal or mirror with slits or lines engraved or scribed on it. The transmission grating allows light to pass through it while the reflection grating reflects light from it.

## What is Grating Element?

The grating element is the distance between the centers of any two adjacent slits or lines on the grating. It is denoted by d and is usually expressed in meters or nanometers. The grating element determines the angular separation and resolution of the diffracted beams. The smaller the grating element, the larger the angular separation and resolution.

## What is Grating Equation?

The grating equation is a mathematical formula that relates the angle of incidence, angle of diffraction, wavelength of light, and grating element for a given order of spectrum. It is given by:

where d is the grating element, θi is the angle of incidence, θd is the angle of diffraction, n is the order of spectrum (positive or negative integer), and λ is the wavelength of light.

## What are Some Common Viva Questions on Diffraction Grating?

Here are some common viva questions on diffraction grating that you may encounter in your exam:

What is the principle of diffraction grating?

How do you measure the wavelength of light using diffraction grating?

How do you measure the grating element using diffraction grating?

How do you calculate the resolving power of diffraction grating?

What are the advantages and disadvantages of diffraction grating over prism?

What are the factors that affect the intensity and width of diffracted beams?

How do you distinguish between first order and second order spectra?

How do you minimize errors and uncertainties in diffraction grating experiment?

What are some applications of diffraction grating in science and technology?

You can find the answers and explanations to these questions in our viva questions on diffraction grating pdf download. This pdf contains more than 50 viva questions on diffraction grating along with their detailed solutions. You can use this pdf as a reference guide or a study material for your exam preparation.

## How to Prepare for Viva Exam on Diffraction Grating?

To prepare for viva exam on diffraction grating, you should follow these steps:

Review the theory and concepts of diffraction, interference, spectrum, and resolution.

Practice the numerical problems and calculations based on the grating equation and resolving power.

Perform the diffraction grating experiment in the lab and note down the observations and results.

Analyze the data and plot the graphs using appropriate software or tools.

Download our viva questions on diffraction grating pdf and go through them carefully.

Understand the answers and explanations and try to explain them in your own words.

Revise the important formulas, definitions, terms, and facts related to diffraction grating.

Be confident and calm during the viva exam and answer the questions clearly and concisely.

## Conclusion

We hope that this article has helped you to learn more about viva questions on diffraction grating pdf download. If you have any queries or suggestions, please feel free to contact us. We wish you all the best for your viva exam!

## How to Perform Diffraction Grating Experiment?

To perform diffraction grating experiment, you will need the following apparatus:

A diffraction grating with known number of rulings per cm.

A spectrometer with a collimator, a telescope, and a prism table.

A sodium lamp or a mercury lamp as a source of light.

A meter scale and a vernier caliper.

The steps to perform the experiment are as follows:

Adjust the spectrometer by setting the telescope and the collimator parallel to each other and focusing them on a distant object.

Mount the diffraction grating on the prism table and make it perpendicular to the collimator axis.

Place the sodium lamp or mercury lamp near the slit of the collimator and adjust the slit width to get a sharp spectrum.

Rotate the telescope to observe the spectra of different orders on both sides of the zero order spectrum.

Measure the angle of diffraction for each spectral line of each order using the vernier scale.

Repeat the readings for different wavelengths of light and different orders of spectra.

Calculate the grating element using the grating equation and compare it with the given value.

Calculate the wavelength of light using the grating equation and compare it with the standard values.

## What are the Precautions and Sources of Error in Diffraction Grating Experiment?

To ensure accuracy and precision in diffraction grating experiment, you should follow these precautions and avoid these sources of error:

Make sure that the diffraction grating is clean and free from dust or scratches.

Make sure that the slit width is optimum and not too wide or too narrow.

Make sure that the slit, grating, and telescope are properly aligned and leveled.

Make sure that the vernier scale is zeroed before taking any reading.

Avoid parallax error while reading the vernier scale and use a magnifying glass if needed.

Avoid errors due to refraction, reflection, or dispersion of light by using monochromatic light or filters.

Avoid errors due to temperature variation or vibration by performing the experiment in a stable environment.

## What are some Tips and Tricks for Diffraction Grating Viva Questions?

To ace diffraction grating viva questions, you should follow these tips and tricks:

Review the theory and concepts of diffraction, interference, spectrum, and resolution before the viva exam.

Practice the numerical problems and calculations based on the grating equation and resolving power before the viva exam.

Be familiar with your observations, results, graphs, and calculations from your experiment.

Be prepared to explain your experiment procedure, apparatus, precautions, sources of error, and applications in detail.

Be confident and calm during the viva exam and answer the questions clearly and concisely.

## Viva Questions On Diffraction Grating Pdf Download

If you want to download our viva questions on diffraction grating pdf, you can click on the link below. This pdf contains more than 50 viva questions on diffraction grating along with their detailed solutions. You can use this pdf as a reference guide or a study material for your exam preparation. We hope that this pdf will help you to ace your viva exam!

Viva Questions On Diffraction Grating Pdf Download

## What are the Answers and Explanations to Some Viva Questions on Diffraction Grating?

In this section, we will provide you with the answers and explanations to some of the viva questions on diffraction grating that we have listed above. You can use these answers and explanations as a reference or a guide to understand the concepts and calculations involved in diffraction grating experiment.

### What is the principle of diffraction grating?

The principle of diffraction grating is based on the Huygens-Fresnel principle, which states that every point on a wavefront acts as a source of secondary spherical wavelets and the resultant wave at any point is obtained by superposing these wavelets. When a beam of light falls on a diffraction grating, each slit or line acts as a source of secondary wavelets and these wavelets interfere with each other to form a spectrum of light on a screen or a detector. The condition for constructive interference is given by the grating equation.

### How do you measure the wavelength of light using diffraction grating?

To measure the wavelength of light using diffraction grating, we use the following steps:

Set up the apparatus as described in the experiment procedure.

Measure the angle of diffraction for a given spectral line of a given order using the vernier scale.

Repeat the measurement for different spectral lines and different orders.

Substitute the values of angle of diffraction, order of spectrum, and grating element in the grating equation and solve for the wavelength of light.

Compare the calculated wavelength with the standard value and find the percentage error.

### How do you measure the grating element using diffraction grating?

To measure the grating element using diffraction grating, we use the following steps:

Set up the apparatus as described in the experiment procedure.

Measure the angle of diffraction for a given spectral line of a given order using the vernier scale.

Repeat the measurement for different spectral lines and different orders.

Substitute the values of angle of diffraction, order of spectrum, and wavelength of light in the grating equation and solve for the grating element.

Compare the calculated grating element with the given value and find the percentage error.

### How do you calculate the resolving power of diffraction grating?

The resolving power of diffraction grating is defined as the ability to resolve two closely spaced spectral lines of slightly different wavelengths. It is given by:

where R is the resolving power, λ is the mean wavelength, Δλ is the smallest difference in wavelength that can be resolved, N is the total number of slits or lines on the grating, and n is the order of spectrum. To calculate the resolving power, we need to know either Δλ or Nn for a given λ.

### What are the advantages and disadvantages of diffraction grating over prism?

The advantages and disadvantages of diffraction grating over prism are as follows:

Advantages:

Diffraction grating produces a linear spectrum while prism produces a curved spectrum.

Diffraction grating has higher resolving power than prism for higher orders.

Diffraction grating has less chromatic aberration than prism.

Diffraction grating is cheaper and easier to manufacture than prism.

Disadvantages:

Diffraction grating produces multiple spectra of different orders while prism produces only one spectrum.

Diffraction grating has lower intensity than prism because light is distributed in different spectra.

Diffraction grating is more sensitive to dust or scratches than prism.

Diffraction grating requires monochromatic light or filters while prism can work with white light.

## Viva Questions On Diffraction Grating Pdf Download

If you want to download our viva questions on diffraction grating pdf, you can click on the link below. This pdf contains more than 50 viva questions on diffraction grating along with their detailed solutions. You can use this pdf as a reference guide or a study material for your exam preparation. We hope that this pdf will help you to ace your viva exam!

Viva Questions On Diffraction Grating Pdf Download

## Conclusion

We hope that this article has helped you to learn more about viva questions on diffraction grating pdf download. In this article, we have covered the theory and concepts of diffraction grating, the experiment procedure and apparatus, the calculations and graphs, the precautions and sources of error, and the answers and explanations to some common viva questions. We have also provided you with a link to download our viva questions on diffraction grating pdf that contains more than 50 viva questions along with their detailed solutions. You can use this pdf as a reference guide or a study material for your exam preparation. If you have any queries or suggestions, please feel free to contact us. We wish you all the best for your viva exam! ca3e7ad8fd