Diffraction grating practical lab: Practice Quiz 

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Viva Questions Determine the wavelength of the laser light by diffraction grating and demonstration.

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1. What is diffraction grating?


2. What is diffraction?


3. Does diffracted Waves can interfere?


4. What are the Laser light characteristics ?


5. What is the formula for to find the percentage error?

Observed value=A

Standard value=B

  1. Error = \frac{A-B}{B}\times 100
  2. Error = \frac{A-B}{A}\times 100
  3. Error = \frac{A-B}{2B}\times 100
  4. Error = \frac{2A-B}{B}\times 100



6. What is the condition for constructive interference?


7. What is population Inversion?


8. What is grating Element?


9. How to find the grating element of a given diffraction grating having 1500 Lines Per Inch (LPI)?


10. What is the standard value of Red Color wavelength in He-Ne gas LASER?



11. What is spontaneous and stimulated emission process?


12. What is full form of the LASER?


13. What is Interference?


14. Why do you use n lembda= d sin theta formula? What is the origin to derive this formula for this experiment?



Video: Just click the link and watch the video

In the above video, you can watch the demonstration of the experiment includes the diffraction grating practical lab. The grating is a glass slab that may have a number of lines known as grating elements. You may have noticed the text on the glass slab, i.e., 15000 LPI. It means 15000 thousand lines per inch.

How to perform diffraction grating practical lab

You know that in one inch is equal to 2.54 cm. So if you have to determine the grating element then you have to solve it mathematically. You can perform a diffraction grating practical lab with any laser.

More you can observe from the quiz.


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