Discover the Answers to These Light and Electromagnetic Wave Questions!

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The discussion centers on a student's request for help with physics homework related to light and electromagnetic waves. Participants emphasize the importance of showing prior attempts at solving the problems before seeking assistance, as per forum rules. The problems include calculating the angle of mirror rotation, determining the critical angle for light refraction, and understanding the relationship between electric and magnetic fields in a plane wave. Forum members stress that the goal is to facilitate learning rather than provide direct answers. Adhering to the forum's guidelines is crucial for receiving help effectively.
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Please! Help me.. I'm student.

Homework Statement


1. A light ray reflected from a flat mirror moves through an angle of 143* as the mirror is rotated. Through **what angle was the mirror rotated?

2. The speed of light in a material is 0,57c. what is the critical angle of a light ray at the interface between the material and a vacuum?

3.The electric field of plane electro magnetic wave is E=240V/m. At the same instant of time the magnetic field is...?
 
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welcome to pf!

hi namvip6666! welcome to pf! :wink:

show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:
 


tiny-tim said:
hi namvip6666! welcome to pf! :wink:

show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:

Can you solve for me all of them. I don't kno*w how to do it.
 


namvip6666 said:
Can you solve for me all of them. I don't kno*w how to do it.

That's not how this forum works. Read the forum rules and post the problem in the proper format, as tiny-tim said to. Once you've shown what you DO understand and what you DON'T understand, then we can help with what you don't understand.

We're NOT here to solve your problems, we're here to help you learn how to THINK about your problem so you can solve it yourself.
 


phinds said:
That's not how this forum works. Read the forum rules and post the problem in the proper format, as tiny-tim said to. Once you've shown what you DO understand and what you DON'T understand, then we can help with what you don't understand.

We're NOT here to solve your problems, we're here to help you learn how to THINK about your problem so you can solve it yourself.

So, can you tell me the formula to calculate it?
 


namvip6666 said:
So, can you tell me the formula to calculate it?

Read the forum rules and post the problem in the proper format as I said in the first place
 
namvip6666 said:
So, can you tell me the formula to calculate it?

no, namvip6666, if you're going to learn, you tell us the formulas

1 is about reflection of light, 2 is about refraction of light, 3 is about E and B of a plane wave …

tell us what equations you know about these three situations …

if you don't know any, go back to your lecture notes or your book, and find some :smile:
Please! Help me.. I'm student.

so study! :wink:
 


Namvip6666, if you seek help here on the physics forums in your homework, you need to show some of your attempts at the solution. If you just come here and plead that "i am a student, please help", "Please give me the solution to it" no one is going to help you. Moreover you should first check the rules before asking help in Homework section.

Greg Bernhardt said:
On posting questions: Any and all high school and undergraduate homework assignments or textbook style exercises for which you are seeking assistance are to be posted in the appropriate forum in our Homework & Coursework Questions area--not in blogs, visitor messages, PMs, or the main technical forums. This should be done whether the problem is part of one's assigned coursework or just independent study. The reason for this is that the scientific and mathematical sections of Physics Forums are to be reserved for discussions and not academic assistance. Since graduate level assignments are meant to be more thought provoking (and hence more worthy of discussion), graduate level questions will be allowed in the relevant part of the main section of PF, provided that the graduate student attempts the problem and shows his work.

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