MEDIUM
12th CBSE
IMPORTANT
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The ratio of intensity at maxima and minima is 25:16. The ratio of the width of the two slits in Young's double slit experiment will be _____ : 1.

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Important Questions on Wave Optics

MEDIUM
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 2 - Wave Optics>Problems For Practice>Q 5
Two coherent sources whose intensity ratio is 81:1 produce interference fringes. The ratio of intensity of maxima and minima in the fringe system is _____ : 16.
MEDIUM
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 2 - Wave Optics>Problems For Practice>Q 6
The width of one of the two slits in a Young's double slit experiment is double of the other slit. Assuming that the amplitude of the light coming from a slit is proportional to the slit width, ratio of the maximum to the minimum intensity in the interference pattern x:1. Value of x is 
HARD
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 2 - Wave Optics>Problems For Practice>Q 1
A soap film 5×10-5 cm thick is viewed at an angle of 35° to the normal. Find the wavelength of light in the visible spectrum which will be absent from reflected light (μ=1.33). Given wavelength range of the visible spectrum is 3900Å to 7800Å.
MEDIUM
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 2 - Wave Optics>Problems For Practice>Q 2
A thin film of thickness 4×10-5 cm and μ=1.5 is illuminated by white light incident normal to its surface. What wavelength (expressed in Å ) in the visible range be intensified in the reflected beam?
MEDIUM
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 2 - Wave Optics>Problems For Practice>Q 3
In a thin film, between two points A and B, eight fringes are observed with light of wavelength 5461 Å. How many fringes will be observed between the same two points A and B if the wavelength of light used is 6500 Å?
MEDIUM
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 2 - Wave Optics>Problems For Practice>Q 4
With a thin air film between two points, 6 fringes appear when light of wavelength 5890 Å is used. Calculate the difference in the thickness of the film (expressed in μm) between the two points.
MEDIUM
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 2 - Wave Optics>Problems For Practice>Q 5
White light is incident normally on a plane parallel thin film of μ=1.5. Find the minimum thickness of the film in nm for which light of λ=4000 Å is absent from the reflected light.
HARD
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 2 - Wave Optics>Problems For Practice>Q 6
A soap film of refractive index 4/3 and thickness 1.5×10-4cm is illuminated by white light incident at angle of 45°. The reflected light is examined by a spectroscope in which a dark band corresponding to the wavelength 5×10-5 cm is found. Find the order of the interference band.