Higher Physics - Interference

Higher Physics - answering a question on interference of light. Calculating the wavelength of the light source and discussing the effect of altering the grating.

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[aimeekyle]

Thank you so much this will help me with my prelim tomorrow!

[vource]

15 days till my exam and I am terrible at this topic, so over.

[Taha-qt]

Hi there.

I'm having difficulties understanding which equation to use between

*path difference=n(lamda)*

And

*path difference=(n+1/2)(lamda)*

Can you please clarify which equation to use in what situation.

Thank you and take care, your videos are very helpful.

[wittedcoronet]

Why do you do 1/(lines per metre) to find the distance between the slits in the grating