Answer the following.
What type of wavefronts are associated with a point source of light?
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Wave Optics - ISC Class 12 Physics Questions with Answers, Page 3
75 past-paper questions on Wave Optics from ISC Class 12 Physics papers (2027-2018), newest first, in full. Questions 41-60 are on this page, 20 to a page. Tap "Show answer" under a question to see its answer.
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Derive the following.
Using Huygen’s wave theory, show that (for refraction of light):
$\frac{\sin i}{\sin r} = \text{Constant}$
where terms have their usual meaning. You must draw a neat and labelled diagram.
To show: $\frac{\sin i}{\sin r} = \text{Constant}$
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Derive the following.
In Young’s double slit experiment, show that:
$\beta = \frac{\lambda D}{d}$
where the terms have their usual meaning.
To show: $\beta = \frac{\lambda D}{d}$
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Derive the following.
Using Huygen’s wave theory of light, show that the angle of incidence is equal to the angle of reflection. Draw a neat and labelled diagram.
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Answer the following.
In a single slit Fraunhofer diffraction experiment, how does the angular width of central maximum change when the slit width is increased?
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Solve the following.
Calculate the angular width of the central maxima obtained in Fraunhofer single slit diffraction experiment, when a monochromatic light of wavelength $550\text{ nm}$ falls normally on a rectangular slit of width $1\cdot1 \times 10^{-4}\text{ cm}$.
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Derive the following.
Using Huygen’s wave theory, prove Snell’s law of refraction of light.
Given: A plane wavefront incident on a plane refracting surface separating two media
To show: $\frac{\sin i}{\sin r} = \frac{v_1}{v_2} = \mu$
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Answer the following.
In Young’s double slit experiment, the distance of the $4^{\text{th}}$ bright fringe from the centre of the interference pattern is $1\cdot5\text{ mm}$. The distance between the slits and the screen is $1\cdot5\text{ m}$ and the wavelength of light used is $500\text{ nm}$. Calculate the distance between the two slits.
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Solve the following.
How will its value change if the experiment is repeated with monochromatic light of greater wavelength?
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Answer the following.
What is the essential condition for obtaining a sustained interference?
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Choose the correct option.
Cylindrical wavefronts are produced by:
- (a)a point source of light
- (b)a line source of light
- (c)a source at infinity
- (d)all types of sources of light
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Choose the correct option.
What type of wavefronts are associated with a source at infinity?
- (a)Cylindrical wavefronts
- (b)Plane wavefronts
- (c)Spherical wavefronts
- (d)All types of wavefronts
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Answer the following.
In Young’s double slit experiment, what is the path difference between the two light waves forming 5th bright fringe on the screen?
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Answer the following.
Give an example of coherent sources of light.
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Choose the correct option.
In Young’s double slit experiment, what is the effect on fringe pattern if the slits are brought closer to each other?
- (a)Fringes disappear.
- (b)Fringe width increases.
- (c)Fringe width decreases.
- (d)Fringe width remains unaltered.
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Answer the following.
What is meant by Constructive interference?
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Answer the following.
In Young’s double slit experiment, what should be the phase difference between the two overlapping waves to obtain 5th dark band/fringe on the screen?
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Answer the following.
In a single slit diffraction experiment, how does the angular width of the central maxima change when:
(a)[1.0]
screen is moved away from the plane of the slit?
(b)[1.0]
width of the slit is increased?
(c)[1.0]
light of larger wavelength is used?
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Answer the following.
What is meant by a wavefront?
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Answer the following.
Using Huygen’s wave theory of light, prove Snell’s law of refraction of light.
Given: A plane wavefront incident at an angle $i$ on a refracting surface separating two media with speeds $v_1$ and $v_2$
To show: $\frac{\sin i}{\sin r} = \frac{v_1}{v_2} = \text{constant}$
No answer yet.