Planck's Theory

The wave theory of light helped explain each and every aspect of optics up to the last decimal point. Interference, Diffraction, Refraction, Reflection and many more phenomenons except one thing, and that was the black body radiation. The Classical Theory predicted that the total energy radiated by a body at higher frequencies tends to infinity(black curve in the pic). But we all know that is not possible when it comes to radiating energy....

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Large Magellanic Cloud

The Large Magellanic Cloud (LMC) is a nearby irregular galaxy, and is a satellite of the Milky Way. At a distance of slightly less than 50 kiloparsecs (≈160,000 light-years), the LMC is the third closest galaxy to the Milky Way, with the Sagittarius Dwarf Spheroidal (~ 16 kiloparsecs) and Canis Major Dwarf Galaxy (~ 12.9 kiloparsecs) lying closer to the center of...

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Critical Angle

Critical angle is the angle at which the light ray travelling form a denser medium to a rarer medium grazes along the surface rather than escaping directly. The angle of refraction in 90° for the angle of incidence equal to critical angle. A ray of light which is incident of the boundary separating the two optical mediums is incident at angle greater than critical angle will get reflected. This phenomenon is called Total Internal Reflection. The...

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How does our phone Vibrate?

There is a device that takes vibration to high-tech extremes. Any parent whose child owns a Tickle-Me-Elmo doll has experienced this technology. Elmo has a vibration system (designed to simulate body-shaking laughter) that is powerful enough to cause many children to drop the toy. The vibration system inside a pager works exactly the same way on a smaller scale, so let's use Elmo as an example. Inside the control unit (on the right hand side...

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UV rays

Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than X-rays, in the range 10 nm to 400 nm, and energies from 3 eV to 124 eV. It is named because the spectrum consists of electromagnetic waves with frequencies higher than those that humans identify as the colour violet. These frequencies are invisible to humans,...

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Infrared Radiations

Infrared (IR) light is electromagnetic radiation with a wavelength longer than that of visible light, measured from the nominal edge of visible red light at 0.74 micrometres (µm), and extending conventionally to 300 µm. These wavelengths correspond to a frequency range of approximately 1 to 400 THz, and include most of the thermal radiation emitted by objects near room...

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