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Category: Light

Using ray diagrams to better understand everyday reality – Demo

Using ray diagrams to better understand everyday reality – Demo

One of the easiest way to visualize ray diagrams for lenses is by using an array of arrows on the board as the object and the camera on your phone as the screen. (i) Convex Lens : Arrows on the board are placed outside the focal length of the lens -> Inverted image (ii) Convex Lens :Arrows on the board are placed inside the focal length of the lens -> Magnified Erect image (iii) Concave Lens: Irrespective of whether you…

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Physics of invisibility

Physics of invisibility

(This page will be updated as the quarter progresses with other techniques that you will eventually learn about) There are many way to make things “disappear” and impart the illusion of invisibility. Based on what you have studied so far, here is one possible ways you can do so. (There are certainly other ways and I strongly recommend spending some time thinking about this) Using the refractive index If you want to make something invisible,you have to ensure that the…

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Leslie speaker, Doppler effect and the Nobel Prize in Physics 2019

Leslie speaker, Doppler effect and the Nobel Prize in Physics 2019

The Nobel Prize in Physics 2019 was awarded “for contributions to our understanding of the evolution of the universe and Earth’s place in the cosmos” with one half to James Peebles “for theoretical discoveries in physical cosmology”, the other half jointly to Michel Mayor and Didier Queloz “for the discovery of an exoplanet orbiting a solar-type star.” In this sub-section we will try to understand how Michel Mayor and Didier Queloz discovered the first ever exoplanet – 51 Pegasi b…

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Van Gogh’s The Starry Night, Turbulence and Adaptive optics

Van Gogh’s The Starry Night, Turbulence and Adaptive optics

Van Gogh’s The Starry Night is a stunning painting that artistically brings out the effect of turbulence in our atmosphere. And this turbulence of air in addition to the effect of varying refractive index of the layers in our atmosphere causes the twinkling of stars: If you are an astronomer trying to study the cosmos from the earth, this turbulence of air and twinkling of stars is a total nightmare. The last thing that you want the light that painstakingly…

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