Physics -Important Points To Remember

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Physics – Important Points

* Colour Blindness was first discovered by Horner (1976)

* 3D image is known as Hologram

* Human eyes have convex lens

* Raman effect is related to Scattering

* Heat energy are transmitted as Infra Red Rays

* Speed of Light is maximum in Vaccum

* Focal Distance of lens is maximum for Red Light and minimum for Violet light

* Magnifying Glass is Convex Lens of small focal length

* Power measures the degree of divergence or convergence and is measured in Diopetres

* If a transparent material is invisible in any liquid , then both of them have same refractive index

* Rainbow are always formed in direction opposite to the sun

* Bolometer is used for detection of Infra Red rays

* The direction of wave is independent of velocity , wavelength and frequency

* Positive sign is for convergence or a convex lens

* Negative sign denotes divergence or a concave lens

* Power of Sunglass is Zero

* Hypo or Radium Thiosulphate is used for fusing in Photography

* Refractive index of a material is independent of angle of incidence

* The frequency of visible light varies betwen 400nm to 700nm

* Logitudnal Waves can’t be polarized

* There is no change in frequency of sound when it changes medium but its velocity, direction and intensity will be changed

* Ammonia is used as a coolant in refrigerator

* Specific Heat of water is 1 calorie/gram °C

* Audible Frequency ranges from 20 Hz to 20,000 Hz

* If there is a relative motion between the source and the observer, then the frequency of sound heard by the observer might be different from the frequency of the source (Doppler’s effect)

* As temperature of medium increases, its refractive index increases

* The first use of telescope for research was by Galelio of Italy in 1609

* At room temperature velocity of sound is 330m/sec

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