Ch 10. Wave Optics Flashcards
The concept of secondary wavelets was given by
Huygens
The value of maximum amplitude produced due to interference two waves given by Y1 = 4sinωt and Y2 = 3 cosωt is
Y niche 1, ω (omega), Y niche 2
5
The reason for the phenomenon of interference is
Phase Difference
Which is used to produce polarised light?
Nicol prism
The width of diffraction fringes is ………. to the width of interference fringes.
Unequal
When the distance between source of light and screen is increased, then fringe width
Increases
Light is a transverse wave because it shows
Polarization
The wave front due to a point source at a finite distance from the source is
Spherical
Interference of light is the redistribution of which of the following physical quantities?
Intensity
Width of interference fringe is
β = λD/d
The value of maximum amplitude produced due to interference of two waves is given by y₁ = 4 sin wt and y₂ = 3 cos wt
5
The phase difference φ is related to path difference △x by
λ/2π φ
Brewster’s law is
µ = tan ip
The colour of a thin film is due to
Interference
In the following question number 1 to 4, there are two column. Column 1 contains 4 questions. You have to match the correct options of these questions as A,B,C and D from column 2.
- Brewster’s law = Polarisation
- Liquid lens = Human eye
- Chromatic Aberration = Defect of image
- Young’s double slit experiment = Interference
For the following question number 8 to 10 a paragraph is given. Read carefully the paragraph and select the correct answer out of given 4 options :
Paragraph
If two waves having amplitude A and B super imposes on each other and resultant amplitude is
A = √a² + b² + 2ab cosφ. where φ = phase constant. Intensity ( I ) is directly proportional to square of amplitude.
I ∝ A²
I ∝ (a² + b² + 2abcosφ)
In constructive interference I max = (a+b)²
In destructive interference I min = (a-b)²
Light waves from two coherent sources producing have intensity ratio 81 : 1.
Q. The ratio of maxima and minima in the interference pattern is
9 : 1
The ratio of amplitude of light waves from two sources in
9 : 1
For maximum intensity the value of cosθ is
+1
