1. P

    The mangifying glass

    When the light go throw a object that reflect a light and magnifying class it show the object bigger. Why the object become bigger? What happen in the atoms and molecules of the glass when the light pass throw it?
  2. K

    Spherical glass vs parabolic acrylic

    Hello, I am trying to buy the parts to perform a Schlieren experiment (see an example here: It is suggested to use a Spherical Primary Telescope Mirror (glass), however when i look into getting larger than 160 mm versions, they start to get extremely expensive...
  3. S

    Cast shadow from waterdroplets on a glass window

    I have query on what is the underlyng principle of Physics behind my observation of a "Shadow created when light passes through a waterdroplets on a glass window" Thanks in advance for your answers.
  4. L

    heating on glass

    Hi, i need some help to determine heating on glass for the glass door freezer with inner cabinet temperature -25°C needed to avoid condensation by calculation and let say the dewpoint temperature that i want is 31°C. Test was run without any heating and the glass temperature that i get is...
  5. timemachine2

    Can any element have the electron energy levels of glass.

    I am hoping that electrons in any element have can have energy levels, or shell levels that do not excite photons of light, like in glass, and other transparent materials. Maybe you could use laser light with a certain intensity to get the electron to the shell level you wanted, the shell level...
  6. timemachine2

    what is the secret to glass's transparency.

    In glass, the elements that make it up, like silicon, and sodium. Does the electron eV levels change as these elements become molecules ;D, and become solid glass. To put it another way, if silicon, sodium, and calcium atoms which have there fixed eV shell levels for electrons. If these...
  7. H

    Refractive index of glass block

    A student wants to find the refractive index of a rectangular block of glass. He draws around the block and marks the position of a ray of light that travels through the block. With the block removed, the student can draw in a normal line and then measure the angle of incidence and the angle of...
  8. timemachine2

    Is this description for silicon in glass how much eV the electron needs to leave the

    ... ground state, and move to shell 2. Energy gap 1.12 eV? and also, Energy separation (EΓL) 4.2 eV Maybe its not the same silicone that goes into glass. When I Search for glass electron shell eV no websites get to the point with the answer. If I get a idea how much glass electrons need to get...
  9. timemachine2

    Is this the eV for electrons to move higher in shells in glass.

    Is this description for silicon in glass how much eV the electron needs to leave the ground state, and move to shell 2. Energy gap 1.12 eV? and also, Energy separation (EΓL) 4.2 eV Maybe its not the same silicone that goes into glass. solid state physics can be VERY DIFFERENT than atomic...
  10. timemachine2

    Does anybody know the energy shells eV for glass, and SOLID carbon

    Glass does not absorb any light, exept UV. but what is the eV for the glass electron to get excited and leave the ground state, and move up to shell level 2, or energy band 2. Also when carbon electrons are in the ground state, how much eV from light or any other EM radiation does it take for...
  11. S

    (HELP) How to smash ice or glass with sound

    Hi everyone! for a marketing campaign we want to shatter ice or glass using sound - like when in films someone screams and all glass windows break..Is this feasible and how would you go by doing it? Any help would be much appreciated! Thanks :)
  12. J

    Laser and glass fiber

    Hi, If I wound a coil of glass fibers and would like to let her high energy laser beam. Which fields would be generated in the coil and the surrounding area? Thank you.
  13. W

    Glass Sphere with Scratch

    Hi was hoping to get some help with this problem I cant picture the actual problem. A glass sphere 5 cm in diameter has a small scratch on its surface. When the scratch is viewed from a position directly opposite where does the scratch appear and what is its magnification? Assume n= 3/2 for...
  14. J

    Which of the glass lenses above... Which of the glass lenses above, when placed in air, will cause rays of light (parallel to the central axis) to diverge? 1. Z,B, and C 2. Z, P, B, and S 3. B and C 4. Z, C, and S 5. P and C 6. Z, B, and H 7. Z, H, and S 8. Z, P and H 9. P and H 10. Z, P, C, and S
  15. G

    Find angle of refraction

    Light in air is incident on a glass surface at 30°. If the refractive index is 1 .55 find the angle of refraction. Explain what is meant by the critical angle and calculate it for this glass. Stuck on this. Help please Thanks c= 3x10^8 ms
  16. I

    Glass Slab question

    The velocity of light in a medium is 2 * 10^8 m/s. A ray of light is incident at the interface of the medium on the optically denser side at 30◦ . What is the angle for refraction ? Now, I'm it possible to find this answer? THe abosolute refractive index is not given, we could...
  17. W

    Magnifying glass

    When a magnifying glass is moved closer and closer to my eyes, the magnified image seen through lens becomes smaller and at a certain distance it becomes blurred. Why would it become blurred? Is it because of the minimum distance that can be seen by eye or of other reason? By constructing a...