Class 12 ISC Physics Wave Optics Board Questions
Here we provide Class 12 Physics important notes,board questions and predicted questions with Answers for chapter Wave Optics. These important notes,board questions and predicted questions are based on ISC board curriculum and correspond to the most recent Class 12 Physics syllabus. By practising these Class 12 materials, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 12 Board examinations as well as other entrance exams such as NEET and JEE.
2017
Q1
Draw the intensity pattern for single slit diffraction and double slit interference. Hence, state
two differences between interference and diffraction patterns.
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solutions
Q2
Define wavefront. Use Huygens’ principle to verify the laws of refraction.
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solutions
2018
Q1
(a) If one of two identical slits producing interference in Young’s experiment is covered with
glass, so that the light intensity passing through it is reduced to 50%, find the ratio of the
maximum and minimum intensity of the fringe in the interference pattern.
(b) What kind of fringes do you expect to observe if white light is used instead of monochromatic light ?
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(b) What kind of fringes do you expect to observe if white light is used instead of monochromatic light ?
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Q2
(a) Define a wave front. Using Huygens’ principle, verify the laws of reflection at a plane surface.
(b) In a single slit diffraction experiment, the width of the slit is made double the original width. How does this affect the size and intensity of the central diffraction band ? Explain.
(c) When a tiny circular obstacle is placed in the path of light from a distant source, a bright spot is seen at the center of the obstacle. Explain why ?
solutions
(b) In a single slit diffraction experiment, the width of the slit is made double the original width. How does this affect the size and intensity of the central diffraction band ? Explain.
(c) When a tiny circular obstacle is placed in the path of light from a distant source, a bright spot is seen at the center of the obstacle. Explain why ?
solutions
2019
Q1
Define the term wavefront using Huygen’s wave theory, verify the law of reflection.
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solutions
Q2
Describe any 2 characteristic features with distinguish between interference and diffraction
phenomena there’s expression for the intensity at a point of the interference pattern in Young’s
double slit experiment
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solutions
Q3
In the diffraction due to a single slit experiment the aperture of the slit is 3mm if monochromatic
light of wavelength 620 nm incident normally on the split, calculate the separation between the
first order minima and the 3rd order maxima on one side of the screen the distance between the slit
and the screen is 1.5 m.
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solutions
2020
Q2
Define wavefront of a travelling wave. Using Huygens principle, obtain the law of refraction at a
plane interface when light passes from a denser to rarer medium.
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solutions
Q3
What is the effect on the interference fringes in Young’s double slit experiment due to each of the
following operations ? Justify your answers.
(a) The screen is moved away from the plane of the slits.
(b) The separation between slits is increased.
(c) The source slit is moved closer to the plane of double slit.
solutions
(a) The screen is moved away from the plane of the slits.
(b) The separation between slits is increased.
(c) The source slit is moved closer to the plane of double slit.
solutions
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