Answer the following.
What is the phase difference between any two points lying on the same wavefront?
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Wave Optics - ISC Class 12 Physics Questions with Answers, Page 4
75 past-paper questions on Wave Optics from ISC Class 12 Physics papers (2027-2018), newest first, in full. Questions 61-75 are on this page, 20 to a page. Tap "Show answer" under a question to see its answer.
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Solve the following.
In Young’s double slit experiment, the screen is kept at a distance of $1\cdot2\text{ m}$ from the plane of the slits. The two slits are separated by $5\text{ mm}$ and illuminated with monochromatic light having wavelength $600\text{ nm}$. Calculate:
(i)[1.5]
Fringe width i.e. fringe separation of the interference pattern.
(ii)[1.5]
Distance of 10th bright fringe from the centre of the pattern.
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Answer the following.
(i)[2.0]
Draw a labelled graph of intensity of diffracted light ($I$) versus angle ($\theta$) in the Fraunhofer diffraction experiment for a single slit diffraction.
Draw: Graph of intensity of diffracted light (I) versus angle ($\theta$) in Fraunhofer diffraction by a single slit
(ii)[1.5]
State the law of Malus.
(iii)[1.5]
How will you distinguish experimentally between ordinary light and plane polarized light?
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Answer the following.
What should be the path difference between two waves reaching a point for obtaining constructive interference in Young’s Double Slit experiment?
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Derive the following.
Draw a neat labelled diagram of Young’s Double Slit experiment. Show that $\beta = \frac{\lambda D}{d}$, where the terms have their usual meaning (either for bright or dark fringe).
To show: \beta = \frac{\lambda D}{d}
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Derive the following.
Derive the law of reflection using Huygen’s Wave Theory.
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Choose the correct option.
A beam of light is incident at the polarizing angle of $35^\circ$ on a certain glass plate. The refractive index of the glass plate is:
- (a)$\sin 35^\circ$
- (b)$\tan 35^\circ$
- (c)$\tan 55^\circ$
- (d)$\sin 55^\circ$
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Answer the following.
Ordinary (i.e. unpolarised) light is incident on the surface of a transparent material at the polarising angle. If it is partly reflected and partly refracted, what is the angle between the reflected and the refracted rays?
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Answer the following.
(i)[3.0]
Using Huygen’s wave theory, derive Snell’s law of refraction.
(ii)[2.0]
With the help of an experiment, state how will you identify whether a given beam of light is polarised or unpolarised.
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Answer the following.
When a ray of ordinary light is incident on the surface of separation of two media at polarizing angle, show with the help of a labelled diagram that reflected ray and the refracted ray are mutually perpendicular to each other.
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Answer the following.
In Young’s double slit experiment, show graphically how intensity of light varies with distance.
Draw: graph showing variation of intensity of light with distance in Young's double slit experiment
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Answer the following.
Define coherent sources of light.
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Answer the following.
State the Law of Malus.
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Derive the following.
Draw a neat and labelled diagram of an experimental setup of Young’s double slit experiment to study the interference of light and show that:
$\beta = \frac{\lambda D}{d}$
where the terms have their usual meaning. Show intensity variation in the interference pattern graphically.
To show: $\beta = \frac{\lambda D}{d}$
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Answer the following.
In Fraunhofer diffraction, how is the angular width of the central bright fringe affected when slit separation is increased?
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