Sponsor Area
Wave Nature Of Light: Huygens Principle
What is the shape of the wavefront diverging from a point source of light?
Spherical
White light is passed through sodium vapours contained in a thin walled glass flask and the transmitted light is examined with the help of a spectrometer. The spectrum so obtained is:
-
Absorption spectrum
-
Solar Spectrum
-
Band Spectrum
-
Continuous Spectrum
A.
Absorption spectrumOn the basis of Huygen’s wave theory, prove Snell’s law of refraction of light. Draw a neat and lebelled diagram. (Postulates of Huygen’s wave theory not required).
On the basis of Huygen's wave theory, the laws of refraction
Given : AEB is the incident wave front and DGC be the refracted wavefront.
BC = V1t V1 = velocity of light in medium 1.
AD = V2t V2 = velocity of light in medium 2.
i) Existence of the refracted wave front DGC
ii) 
Construction : From the point F a perpendicular FH is dropped.
Proof: ΔABC + ΔFHC [By simple geometry these triangles are similar (A.A.A.)]
State any one postulate of Huygen’s wave theory.
Huygen's wave theory states that every particle of the medium situated on the wavefront acts as a new wave source from which the fresh wave originates. These waves are called secondary wavelets.
Sponsor Area
Mock Test Series
Mock Test Series