Five Sure Shot portions for SA2 (Class X CBSE)
The students appearing for SA2 of CBSE class X are requested to practice the following portions of Physics very well so that they can get excellently good marks in Science. Practice all ray diagrams...
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Optics MCQ – image formation by concave mirror
John Abraham asks: I am having trouble with a problem. Q. In an experiment to determine the focal length (f) of a concave mirror by the u–v method, a student places the object pin A on the principal...
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Image formed by a thick Plane Mirror
Vimal Raj asks: “A thick plane mirror forms a number of images of a point source of light . which image is brightest ?” Answer: In the case of a thick plane mirror, reflection takes place at the two...
View ArticleA Numerical from Combination of thin lenses in contact
Two thin lenses of focal lengths f1=20cm and f2=60cm are placed in contact. find the focal length f3 of the combined lenses. find also the focal length f of a third lens placed in contact with these...
View ArticleLIGHT IS TRANSVERSE
In transverse wave,the particles vibrate perpendicular to the direction of wave propagation. “light is a transverse wave.” but light can be propagated without a medium , that is particles. so, how can...
View ArticleSpeed of Light
Saafa asked: “what is the speed of light?” Ans: Speed of Light in Vacuum is 3 x 108 m/s The various experiments conducted to determine the speed of light are [wiki]Foucault[/wiki]‘s method...
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What accounts for the acceleration or deceleration of light when it travels...
“When light passes through different mediums speed changes but who provide acceleration to change velocity?” This question was posted by Jishnu Answer: Just imagine you are participating in a cross...
View ArticleOptics
Rajat asked: “when we exchange the lenses of compound microscope, then why it does not act as a telescope?”
View ArticleNumerical on Eye defect
A myopic eye has a far point of 3m and a near point of 150mm . State the type of spectacle lens needed for viewing an object at normal far point and determine its power in dioptres . Find the near...
View ArticleHuygens Wave Theory and rectilinear propagation of light
As per 12th Physics textbook, it has been mentioned that according to Huygens wave theory of light, light does not travel in straight line. But I have heard that it is wrong and rectilinear propagation...
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