Multiple slit and thin film interference [IB Physics HL]

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We're so excited to be able to share our exams with you!

Cheers, Mitch
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Isnt constructive interference 2dn=(m+1/2)lamda ? That is what wrote on textbook

xxc
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For my Physics HL IA, I'm thinking of exploring Beer-Lambert's Law by seeing how concentration and color (in wavelength) of a solution affects its light absorbance. Is this a viable topic or is it too simple?

abhinavtadi
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The refractive index "n" in the formula "constructive interference 2dn=(m+1/2)lamda" is the index of the secondary(the middle) media, right? I assume there are 3 media from up to the bottom (like air- oil- water)

kafka
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What should you put if you have a question that asks you for the total number of orders you can see in a diffraction grating and you get a decimal. n=2.82, what should the total number of orders seen be? The answer key says 5 even though n=2.82 and I don’t understand why

Thatguy-ntpg
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8:17 for the conversion aren't you supposed to divide it by 1000?

HoneyBee-wrhv
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on my calc is showing as 2*10^-6 m ? am i hallucinating?

festive
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2:19 it's from the fellowship of the ring not game of thrones season 1😭

dvaydvay