Physics 60 Optics: Double Slit Interference (2 of 25) Phase Difference and Double Slit

[@valeriereid2337]

Excellent lecture. Thank you.

[@MichelvanBiezen]

You are welcome!

[@preetiprasad3933]

Sir, thank you for these amazing resources.

[@thephysicist1378]

Sir u are great man and i love the way that you explain😃😃

[@adammma1892]

Sir, in the comments you said that you were an engineer, what discipline do you specialise in. Also thank you for making these videos they are very helpful.

[@MichelvanBiezen]

I have worked on a number of systems and disciplines, but predominately in the area of radars.

[@ashishdwivedi9916]

thank u sir,very useful

[@ahmedmekhimer2180]

I have an inquiry, please. If the angle is bigger that it would make difference, then the approximation which is, according to the unknowns in the video, (λ/d)=(y/L) is no longer applicable. In which case do I use Pythagorean theorem to find the difference between the two beams and then find the phase shift (Assuming that I was given the distances to be able to use Pythagorean)?

[@alsenysylla5013]

Hi, At 3:16, why is the wavelength equal to 360degrees or 2pi?

[@MichelvanBiezen]

+Alseny Sylla The wavelength is 600 nm. If the extra distance traveled by one wave compared to the other wave is 100 nm, how much of a phase shift does that represent? Since 1 wavelength difference represents a phase shift of 2 pi radians (or 360 degrees) a path length difference of 100 m represents a phase shift of 60 degrees (360/6) or pi/3.

[@alsenysylla5013]

+Michel van Biezen Oh ok I go it! I didn't know that 1 wavelength difference represents a phase shift of 2pi. Thank you so much!

[@Peter_1986]

I personally prefer to think of the value 2π as one single constant. I feel that this is a bit more descriptive, because the value 2π is the number of radians for one revolution. A lot of people like to call this constant "tau" or "tough" (τ), and this constant is defined as the ratio between a circle's circumference and its _radius_ instead of its diameter.

[@thomasolson7447]

Beauty product ads were awesome, now they are just plain ick.