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12th CBSE
IMPORTANT
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A Fraunhofer diffraction pattern due to a single slit of width 0.2 mm is being obtained on a screen placed at a distance of 2 m from the slit. The first minima lie at 5 mm on either side of the central maximum on the screen. Find the wavelength of light used in angstrom.

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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 7
A parallel beam of monochromatic light of wavelength 5000 Å is incident normally on a narrow slit of width 0.25 mm. The diffraction pattern is observed on a screen placed at the focal plane of a convex lens placed close to the slit between slit and screen. Find the angular separation between the first secondary maxima on either side of the central maximum.
MEDIUM
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 2 - Wave Optics>Problems For Practice>Q 8
A screen is placed 50 cm from a single slit which is illuminated with light of wavelength 6000 Å. If the distance between the first and third minima in the diffraction pattern is 3.0 mm, width of the slit in mm is
MEDIUM
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 2 - Wave Optics>Problems For Practice>Q 9
Light of wavelength 5×10-7 m is diffracted by an aperture of width 2×10-3 m. For what distance in meter travelled by the diffracted beam does the spreading due to diffraction become greater than the width of the aperture?
MEDIUM
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 2 - Wave Optics>Problems For Practice>Q 10
A parallel beam of light of wavelength 600 nm is incident normally on a slit of width 'd'. If the distance between the slits and the screen is 0.8 m and the distance of 2nd order minimum from the centre of the screen is 9.5 mm, calculate the width of the slit ?
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12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 2 - Wave Optics>Problems For Practice>Q 1
If the angle between the pass axis of polarizer and the analyser is 45°, write the ratio of the intensities of original light and the transmitted light after passing through the analyser.
MEDIUM
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 2 - Wave Optics>Problems For Practice>Q 2

A polariser and an analyser are oriented so that the maximum light is transmitted. What is the fraction of maximum light transmitted when analyser is rotated through

30° 

HARD
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 2 - Wave Optics>Problems For Practice>Q 3
Two polaroids, P1 and P2, are 'set-up' so that their 'pass-axes' are 'crossed' with respect to each other.  A: third polaroid, P3, is now introduced between these two so that its 'pass-axis' makes an angle θ with the 'pass-axis' of P1. A beam of unpolarised light, of intensity I, is incident on P1. If the intensity of light, that gets transmitted through this combination of three polaroids, is I', find the ratio I'I when θ equal30°
MEDIUM
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 2 - Wave Optics>Problems For Practice>Q 4
Two polaroids are crossed to each other. If one of them is rotated through 60°, then what percentage of the incident unpolarised light will be transmitted by the polaroids?