Calculate angle of reflection.

In summary: This should be posted in the Homework Help Section (a moderator will probably move it for you), and posted using the template for homework help threads (which requires you to state the problem, relevant equations, and most importantly, *your attempt* at a solution so far). If you read the forum rules I linked to, you'll see that we don't do your homework for you. We will, however, help set you in the right direction if you aren't getting anywhere with your attempt.In summary,
  • #1
EinsteinKid
2
0
Hello everyone, I am new here to the physics forums. So for my first post I need some help on this problem from my homework. Here we go:

A laser beam of wavelength 632.8 nm shines at normal incidence upon the reflective side of a compact disc. The tracks of tiny pits in which information is coded onto the CD are the 160 um apart. For what angle of reflection will the intensity of light be maximum?

Any help is great appreciate, thank you.
 
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  • #2
Hi EinsteinKid,

Welcome to PF!

https://www.physicsforums.com/showthread.php?t=89899

https://www.physicsforums.com/showthread.php?t=5374

This should be posted in the Homework Help Section (a moderator will probably move it for you), and posted using the template for homework help threads (which requires you to state the problem, relevant equations, and most importantly, *your attempt* at a solution so far). If you read the forum rules I linked to, you'll see that we don't do your homework for you. We will, however, help set you in the right direction if you aren't getting anywhere with your attempt.
 
  • #3
cepheid said:
Hi EinsteinKid,

Welcome to PF!

https://www.physicsforums.com/showthread.php?t=89899

https://www.physicsforums.com/showthread.php?t=5374

This should be posted in the Homework Help Section (a moderator will probably move it for you), and posted using the template for homework help threads (which requires you to state the problem, relevant equations, and most importantly, *your attempt* at a solution so far). If you read the forum rules I linked to, you'll see that we don't do your homework for you. We will, however, help set you in the right direction if you aren't getting anywhere with your attempt.
cepheid

sorry about that, I was reading the rules, I knew right away I messed up. THanks for the heads up
 
  • #4
Please repost your problem--along with your work so far--in the correct forum (such as https://www.physicsforums.com/forumdisplay.php?f=153").

Also, please review our posting rules, which are linked at the top of every page, and the https://www.physicsforums.com/showthread.php?t=94379".

Welcome to PF! :smile:
 
Last edited by a moderator:

1. What is the formula for calculating the angle of reflection?

The angle of reflection can be calculated using the law of reflection, which states that the angle of incidence (incoming ray) is equal to the angle of reflection (outgoing ray). This can be represented by the formula: θr = θi, where θr is the angle of reflection and θi is the angle of incidence.

2. How is the angle of reflection measured?

The angle of reflection is typically measured in degrees using a protractor. The protractor is placed at the point where the incoming ray strikes the reflecting surface and the angle is read from the scale on the protractor.

3. Can the angle of reflection be greater than the angle of incidence?

No, according to the law of reflection, the angle of reflection cannot be greater than the angle of incidence. This is because the angle of incidence represents the angle at which the incoming ray strikes the reflecting surface and the angle of reflection represents the angle at which the outgoing ray reflects off the surface. The two angles are always equal.

4. What is the significance of the angle of reflection?

The angle of reflection is important because it helps determine the direction in which a light ray will reflect off a surface. This is useful for understanding how light behaves and for predicting the path of a reflected ray in situations such as mirror reflections or light reflecting off water surfaces.

5. How does the angle of reflection change with different surfaces?

The angle of reflection can vary depending on the type and shape of the reflecting surface. For example, a flat mirror will always reflect light at the same angle as the angle of incidence, while a curved mirror will reflect light at different angles depending on the curvature of the surface. In general, smooth and polished surfaces will reflect light at predictable angles, while rough or irregular surfaces may cause light to scatter in multiple directions.

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