apni Physics

apni Physics developing physical concepts among students through experiments and simulations. Mainly, focused on these two activities by that students get concept faster. More than 20 experiments are included here for university graduate (B.Sc. Physics, Engineering Physics) students. It doesn’t mean higher or small classes has been ignored. For them, I have tried to use simulations whereas it could be possible at my end. These experiments include basic physical principles, demonstrations along with the viva questions. These questions help to give a new insight and direction of thinking to the students. Recently I have added quizzes for the practices for these experiments and related topics.

I have prepared the physics video lectures along with text materials. One can find the relevant topic through a menu or by searching into the search box. For any problem or mistake, you can email or message me directly. I will try to solve your problem as soon as it will be possible. In addition to the physics video lectures, some other informative tutorials are recorded. Like self-help videos that provide the solution to the students of their day to day life’s problem in a classroom and outside the academic buildings.

Practice This Experiment Quiz

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

1. What is grating Element?


2. What is full form of the LASER?


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



4. What is population Inversion?


5. What is the condition for constructive interference?


6. What is spontaneous and stimulated emission process?


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



8. What is diffraction?


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


10. What is Interference?


11. What are the Laser light characteristics ?


12. What is diffraction grating?


13. Does diffracted Waves can interfere?


14. 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



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