Refraction (4 of 5) Calculating the Critical Angle

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[@stepbystepscience]

@HumanityOTP_ I just generally make the side that the light is coming from n1 and the side that the light would be coming from n2.

[@sanskratipal1026]

Thank you for upload this video... It helped me more to define critical angle ❣️

[@stepbystepscience]

Glad it was helpful! Thanks for watching.

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All you say is right in this video but a little suggestion you should say how 1.55 became 48°

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You're welcome and all the best from Berlin.

[@nwabisanqabeni4982]

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[@stepbystepscience]

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Thank you sir for the wonderful video !!!

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Dhana Abishek You are very welcome, thanks for commenting.

[@DrBatmanPhD]

How would you calculate the critical angle for a bullet ricochet?

[@jazzigymnast]

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[@stepbystepscience]

kiwigymnast16 great, if you are a gymnast then you already have a lot of experience with physics. Thanks for commenting.

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Thanks so much and best wishes

[@studyblack6366]

is the Critical Angle always the Smaller refraction index over the larger, or is it the "first medium" over the "second medium", eg, if we have 2 planes of glass as a display box, the first/outside layer of glass is n=1.5750, the 2nd inside layer is n=1.4899, Critical Angle = InvSin(n1/n2), will n1 be the outside glass, or just the glass with the lower refraction index? as if it calcualted with InvSin(1.5750/1.4899) it will obviously not calculate. So does this mean ther eis no critical angle, or just always calculate with InvSin(Lower n / Higher n) Thanks.

[@stepbystepscience]

In order to get to the critical angle the second material has to have a higher index of refraction.

[@raju115rk]

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[@stepbystepscience]

Thank you for the very nice comment.

[@junhaodeng1093]

Thanks, i finally understand the definition of an critical angle, so it basically is the angle(i) that makes the refracted angle to be 90.

[@stepbystepscience]

Yep!

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I love your explanation! great !

[@stepbystepscience]

+Ray Thank you very much. You can see a listing of all my videos at my website, www.stepbystepscience.com

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[@stepbystepscience]

And I wish you could be m student, Thanks for watching and for all the comments.

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+‫אוראל פישמן‬‎ Glad that the videos could be of help. You can see a listing of all my videos at my website, www.stepbystepscience.com

[@jaydacaviness1427]

Hello! A little help with a problem like this ? : A light ray in water strikes a water-air interface at an angle of incidence of 50 degrees. What happens? What is the angle of refraction? would this apply ? ... I'm so confused lol

[@stepbystepscience]

Maybe you should watch the videos on refraction first.

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pashwa shah Great, hope the exams go well, thanks for commenting.

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[@kently4465]

I have a question - which is the refractive medium, water or air? I need it thanksss

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[@vladimirputin2395]

How do we know the value of thetaC will be = 48.6° ? Where did it come from...do I need to learn trigonometry for that?

[@stepbystepscience]

you can use your calculator.

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Great, thanks for watching and commenting.

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Excellent, I am glad it went well.

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Glad you think so!

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This guy's a genius

[@Autoelectricitychannlae]

How to pot it on the calculate to get the critical angle answer.

[@mathieuadams1448]

how does the formula change if the mediums are different and air is not one of them?

[@stepbystepscience]

Mathieu Adams the formula does not change, just replace the indices of refraction with the ones for the materials you have.

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Thanks for the blessing and the comment.

[@hannahalexis6741]

This was so helpful! Thank you so much! :)

[@stepbystepscience]

+Hannah Alexis You are very welcome, thanks for commenting. You can see a listing of all my videos at my website, www.stepbystepscience.com

[@mustafarashad7353]

Can you help me with this? Develop a method to measure the critical angle for the air/water interface. Using a scientific diagram show a set up that you would use to measure the critical angle between the media of water and air. Based on the teacher, she said that we have to make a chart of 10 trials where each trial will contain two parts. I have no idea of what she is talking about. Is the critical angle the same as the refraction angle or it is only the same as the refraction when its in 90 Degrees? Please help me :(

[@stepbystepscience]

Maybe she just wants you to take 10 different measurements of the angle of refraction from 10 different angles of incidence. Start with angle of incidence at 0 degrees (ray of light perpendicular to surface) and increase angle of incidence 10 times until you get to the critical angle. Does that help?

[@mustafarashad7353]

I guess you are right. Look, so the critical angle is the angle of refraction or is it just the angle of refraction when its at 90 Degrees?

[@stepbystepscience]

The critical angle is the angle of incidence that results in an angle of refraction of 90 degrees.

[@mustafarashad7353]

Ohh ok. Thank you very much. I liked and subscribed :)

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I was gonna go crazy cuz I forgot that when transposing sin, you're gonna have to make it as arc sine and I forgot. DUde hhahah

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[@stepbystepscience]

I hope the exam went well and that you did not fall asleep right in the middle of it!

[@someshfengade9623]

how to find a critical anhle when the refractive indices of air and glass is given plz answer it fast.

[@charansai409]

How 48.6 angle came sir please explain

[@harikamarpohno7072]

how do you find out which is n1 and which is n2? is it given or do you have to figure out yourself?

[@stepbystepscience]

+Harika Marpohno Actually it does not matter. I just generally make the side that the light is coming from n1 and the side that the light would be going to n2.

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[@shaikghouse4501]

Tell me how 0.75 is 48.5degree

[@stepbystepscience]

You have to use the inverse sine button on your calculator. The sine of 48.5 degrees 0.75.

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Sine

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Rajesh Jangra It's English!

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