The Young's double slit experiment is performed with blue light and green light of wavelengths 4360 Å and 5460 Å respectively. If X is the distance of 4 t h maxima from the central one, then

X ( blue ) X ( green ) = 5460 4360

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The figure shows a glass plate placed vertically on a horizontal table with a beam of unpolarised light falling on its surface at $57 °$ with the normal. The electric vectors in the reflected light on the screen $S$ will vibrate with respect to the plane of incidence,

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Important Questions on Wave Optics

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Alpha Question Bank for Engineering: Physics>Chapter 31 - Wave Optics>Exercise - 1>Q 34

Two point white dots are

1 mm

apart on a black paper. They are viewed by an eye having a pupil with diameter

3 mm

. Approximately, what is the maximum distance at which these dots can be resolved by the eye? [Take wavelength of

light = 500 nm

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Alpha Question Bank for Engineering: Physics>Chapter 31 - Wave Optics>Exercise - 1>Q 35

The resolving power of a telescope is more when its objective lens has

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Alpha Question Bank for Engineering: Physics>Chapter 31 - Wave Optics>Exercise - 1>Q 36

Resolving power of a microscope depends upon

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Alpha Question Bank for Engineering: Physics>Chapter 31 - Wave Optics>Exercise - 1>Q 39

Interference is observed due to two coherent sources $A$ and $B$ separated by a distance $4 λ$ along the $y$ -axis where $λ$ is the wavelength of the source. A detector $D$ is moved on the positive $x$ -axis. The number of points on the $x$ -axis excluding the points, $x = 0$ and $x = \infty$ at which maximum will be observed is

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Alpha Question Bank for Engineering: Physics>Chapter 31 - Wave Optics>Exercise - 2>Q 1

If the ratio of the intensity of two coherent sources is

4

then the visibility

[\frac{{(I}_{\max} - I_{\min})}{(I_{\max} + I_{\min})}]

of the fringes is

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Alpha Question Bank for Engineering: Physics>Chapter 31 - Wave Optics>Exercise - 2>Q 2

In a

YDSE

experiment if a slab whose refractive index can be varied is placed in front of one of the slits then the variation of resultant intensity at mid-point of screen with

' μ'

will be best represented by

(μ \geq 1)

. [ Assume slits of equal width and there is no absorption by slab ]

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Alpha Question Bank for Engineering: Physics>Chapter 31 - Wave Optics>Exercise - 2>Q 3

In a Young’s double-slit experiment the slit is illuminated by a source having two wavelengths of

400 nm

and

600 nm .

If the distance between slits,

d = 1 mm

, and distance between the plane of the slit and screen,

D = 10 m

. Then the smallest distance from the central maximum where there is complete darkness is:

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Alpha Question Bank for Engineering: Physics>Chapter 31 - Wave Optics>Exercise - 2>Q 4

If the first minima in a Young's slit experiment occurs directly in front of one of the slits. (distance between slit and screen

D = 12 cm

and distance between slits

d = 5 cm

, then the wavelength of the radiation used is:

The figure shows a glass plate placed vertically on a horizontal table with a beam of unpolarised light falling on its surface at 57° with the normal. The electric vectors in the reflected light on the screen S will vibrate with respect to the plane of incidence,

Important Questions on Wave Optics

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The figure shows a glass plate placed vertically on a horizontal table with a beam of unpolarised light falling on its surface at $57 °$ with the normal. The electric vectors in the reflected light on the screen $S$ will vibrate with respect to the plane of incidence,