1. F

    Calculating wavelength of a 2D grating (different distances between slits)

    For my report I need a formula to calculate the wavelength with a multiple slit experiment. I have found: d sin(\theta) = m \lambda. However, for the experiment a two dimensional grating is used. The distance between the vertical slits are not the same as the distance between the horizontal...
  2. D

    Waves && Optics

    Two waves are linearly polarized. The electric field of one wave is aligned with the x-axis and the other is aligned with the y-axis. In the absence of matter that might change the polarization, can these waves interfere with each other?
  3. D

    A double-slit experiment && Optics

    A double-slit experiment produces fringes on a distant screen. How does the linear separation between the bright maxima on the screen change when the separation between the slits doubles? (Answer: reduces by 1/2)
  4. B

    Color fringes on heated plate

    I've recently noticed that the ceramic plates I have home show an interesting light pattern whenever light is reflected on a slightly heated area of them. The setup is the following: a ceramic plate, a lightbulb a meter above it, and any means of heating such as blowing hot air or putting hot...
  5. A

    Engineering optics

    Hi everyone, I’m not sure about the solution of this question. I know that chromatic aberration would occur and because if that the focal length of the lens would be affected. Can anyone please help me solve this question. I have been caught up with this question for quite long. TIA
  6. K

    Optics for Research

    I have a light beam with diameter of 1mm and I'm trying to reduce it's diameter to less than 50 micrometers (as shown in the image) I was thinking of using one of the high quality camera zoom lens. Any suggestions, or ideas?
  7. O

    Confusion with angular magnification

    The angular magnification defined as, angle subtended by image of object /angle subtended by object when 25 cm from the naked eye Consider this. An object is placing 50cm in front of a convex lens which has a focus length of 100cm. So the image will create 100cm in front of the lens. If we...
  8. I

    Optics for dipped headlight

    I'd like to turn a bike light into a dipped headlight. I.e. it should spread down and sideways, but not up, above eye-level. Can this be achieved with a lens? If so, what shape would this lens be? Assume typical bike-light lens material.
  9. G

    Hard Optics Question

    A parallel beam of light is incident from air at an angle $a$ on the side $PQ$ of a right angled triangular prism of refractive index $n = \sqrt {2}$. Light undergoes total internal reflection in the prism at the face $PR$ when $a$ has a minimum value of $45°$. The angle $\theta$ of the prism...
  10. S

    Ray Optics

    What is Huygen s' Principal?
  11. S

    [advice for a book]: QED applications in quantum optics

    I am a Physicist with a good knowledge of Classical Quantum Mechanics and its applications on Material Physics, Molecular Physics and Atomic Physics. In my undergraduates, I did also some studies about Dirac equation, but I didn't engage myself on things like the Standard Model and Particle...
  12. H

    Fibre optics High school text

    The text book is talking about pulse spreading/dispersion in optical fibres. Book says: "The spreading of the pulse is due to two dispersion effects: (i) Chromatic dispersion occurs because the refractive index of the fibre is different for different frequencies (colours) of light ...
  13. S

    Which optical component (spatial filter) can achieve this?

    Amplitude of an optical wave propagating along the z-axis is given by E = Eo*e^(-x^2) + Eo sin(bx) What kind of optical setup can help filter out the second term from the wave?
  14. P

    optics by hecht

    i have a black and white pdf version of optics by hecht.I am glad that such a book exists.I use it for reference. Is there a multicoloured hard copy of this book in circulation??have anybody seen such an edition?I would be happy to own a hardprint of this book if it is multicoloured.
  15. N

    Physics Of Optics And Time

    PHYSICS OF OPTICS AND TIME Any corrections, different point of view and criticism will be appreciated pls. ABSTRACT: A brief proposition on the nature of light waves and how it affects the measurement of observers. For example, when a disturbance is created in the waves of light due to the...
  16. I

    advance optics

    if a thin lens with a focal length of +10cm is located 2cm in front of a spherical mirror with a radius -18cm. find? (A) the power, (B) the focal length, (C) principle point and (D) the focal point of the thick mirror optical system.
  17. A

    Lens Help?

    Hello, Thanks so much for reading this. I think I'm close I"m just not confidant in my answer. The problem reads: For a thin plano-convex lens, what is the change in focal length (Delta f) for a 100 um change in radius (delta R) of the convex surface. Assume the lens has a visible-wavelength...
  18. N

    How to Learn More About Airy Beams?

    I came across this article was incredibly interested. I've read the paper and the material was completely over my head. What should I, with a high school level education and no background in optics, do to have a complete understanding of the topic discussed in the paper? What sciences would I...
  19. L

    Geomertical optics- derivation of graph of (u+v) against u

    may i know how to derive the the sha[pe of graph and get the point of min (2f , 4f) ? i really have no idea how to get the shape of the graph and the min point.
  20. S

    combination of lens

    1. How will focal length of these two lenses change? i) combining two plano convex lenses attaching plane faces ii) combining two half parts of a convex lens which cut horizontally