# Physics

posted by .

Ray of laser start from the air and collide with the middle side of some matter > How many total internal reflections done in this matter ??
n ( matter)= 1.48
n (air)= 1.00
The length of matter = 42.0 cm
The width of matter = 3.1 mm
Ray of laser collide by angle =20(degree)

• Physics -

Draw the figure. Next, determine the critical angle. Now start to use a geometrical plot to trace the ray. At each side interaction, determine the angle: below critical or not, determine.

## Similar Questions

1. ### Science

Does air have mass? I think it does because air takes up space so it is matter and matter has mass. right you are. To weigh it is a bit tricky. One way is to compress it.
2. ### science

What is matter? And four examples of objects/substances that would be classified as ''matter'' Please help me with this question and anyhting else you know about ''matter''
3. ### science

1. How do you know when something is gas?
4. ### science- I need help!

1. How do you know when something is gas?
5. ### Physics

One practical application of matter waves is A. Lasers B. X-Rays C. Electron Microscope D. None of the above My guess is A, but I'm not sure. "Matter waves" refers to the wave qualities of matter (as opposed to the particle qualities). …
6. ### Astronomy

Basically the ``Bohr radius'' for the dark matter is rB=ℏ^2 / GN M m^2 where m is the dark matter mass, M is the total amount of dark matter mass contained inside the ``gravitational atom'', and ℏ and GN are constants as …
7. ### Science

Check my answers please? Imagine that you remove all the atoms from a chair. What remains?
8. ### physics- Space

How does the amount of dark matter in the Universe compare to the amount of ordinary matter?
9. ### science help PLS

Which of the following statements about matter is false?
10. ### Art

Which of the following is most likely the reason for a city to reject an artist's proposal to create a religious mural on the side of the city library?

More Similar Questions