optics problem Definition and 59 Threads

  1. J

    Solving Light Optics Problem: Find Reflection Point

    Hi, My Question: A beam of light is emitted in a pool from a depth of 62.0 cm. Where must it strike the air-water interface, relative to the spot directy abovie, in order that the light does not exit the water? My Work Tan(49)=(x/62.0cm), got 49 degrees from the textbook where...
  2. C

    How do I find the Fermat Equation for a parabola in optics?

    I need to find a Fermat Equation for a parabola that sends light from a point sour ce on X the access back parrallell to the x access. Thanks If you want to see what I tried, I posted a pic a few days ago, under the title optics, but no one responded at that point.
  3. X

    Optics Problem: What am I doing wrong?

    Hey Everyone.. I'm having trouble with this question, I think I have this question figured out but my answer is coming out incorrect... Tell me if there is a flaw in my logic.. question is: "Suppose that a luminous star of radius R1=1.74×108 m is surrounded by a uniform atmosphere...
  4. C

    Optics problem: electromagnetic theory

    If anyone who's good at optics/physics can help me with this electromagnetic part of optics...it'll be great. so here's the problem: imagine an electromagnetic wave with it's E-field in the y-direction. Show that (dE/dx)=-(dB/dt) applied to the harmonic wave B E=Eo cos(kx - wt)...
  5. N

    What Index of Refraction Causes Total Internal Reflection in a Prism?

    Please help with optics problem! I was wondering if anyone could help me out with the following optics problem: A prism, ABC, is configured such that angle BCA = 90 degrees and angle CBA = 45 degrees. What is the value of the index of refraction if, while immersed in the air, a beam...
  6. R

    Diffraction Pattern Observed w/ Converging Light

    Can anyone explain to me why there is still a diffraction pattern observed even if the light is slightly converging when it hits the diffraction grating
  7. W

    How Do Diffraction Gratings Affect Light Wavelengths?

    Would appreciate anyhelp to solving any of these questions ty. 1 A diffraction grating of pitch 3 .27mm is illuminated at normal incidence with light comprised of various wavelengths. If components of wavelength 495nm, 625nm and 990nm are present find:- a) the angular positions of the...
  8. S

    Converging and Diverging Lens Problem: Finding the Focal Lengths"

    I am having some trouble with this one...any help would be appreciated. A 31.8cm focal length converging lens is 21.6cm behind a diverging lens. Parallell light strikes the diverging lens. After passing through the converging lens, the light is again parallel. What is the focal length of...
  9. R

    Archived Telescope geometric optics problem

    Ok I'm working on my geometric optics homework and this is the last problem and I can't seem to get it right. An 6 astronomical telescope has a 32 cm focal-length objective lens. After looking at stars, an astronomer moves the eyepiece 1.0 cm farther away from the objective to focus on nearer...
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