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JEE Advanced

IMPORTANT

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In the Young's double-slit experiment, the intensities at two points $P_{1}$ and $P_{2}$ on the screen are respectively $I_{1}$ and $I_{2} .$ If $P_{1}$ is located at the centre of a bright fringe and $P_{2}$ is located at a distance equal to a quarter of fringe width from $P_{1}$ then $\frac{I_{1}}{I_{2}}$ is

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Important Questions on Interference and Diffraction of Light

MEDIUM

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 8 - Interference and Diffraction of Light>Objective Problems [Level 2]>Q 2

In Young's double slit experiment the

10^{th}

maximum of wavelength

λ_{1}

is at a distance of

y_{1}

from the central maximum. When the wavelength of the source is changed to

λ_{2}, 5

th maximum is at a distance of

y_{2}

from its central maximum. The ratio

(\frac{y_{1}}{y_{2}})

EASY

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 8 - Interference and Diffraction of Light>Objective Problems [Level 2]>Q 3

Two light rays having the same wavelength

λ

in vacuum are in phase initially. Then, the first ray travels a path

L_{1}

through a medium of refractive index

n_{1}

while the second ray travels a path of length

L_{2}

through a medium of refractive index

n_{2}

. The two waves are then combined to produce interference. The phase difference between the two waves is

EASY

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 8 - Interference and Diffraction of Light>Objective Problems [Level 2]>Q 4

In Young's double-slit experiment, the two slits act as coherent sources of equal amplitude

A

and wavelength

λ

. In another experiment with the same set up the two slits are sources of equal amplitude

A

and wavelength

λ

but are incoherent. The ratio of the intensity of light at the mid-point of the screen in the first case to that in the second case is:

EASY

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 8 - Interference and Diffraction of Light>Objective Problems [Level 2]>Q 5

In the Young's double-slit experiment, when a glass-plate (refractive index

1.5

) of thickness

t

is introduced in the path of one of the interfering beams (wavelength

λ

), the intensity at the position, where the central maximum occurred previously remains unchanged. The minimum thickness of the glass plate is:

EASY

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 8 - Interference and Diffraction of Light>Objective Problems [Level 2]>Q 6

In the standard Young's double-slit experiment, the intensity on the screen at a point distant

1.25

fringe widths from the central maximum is (assuming slits to be identical):

MEDIUM

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 8 - Interference and Diffraction of Light>Objective Problems [Level 2]>Q 7

In a Young's double-slit experiment,

D

is the distance of screen from the slits and

d

is the separation between the slits. The distance of the nearest point to the centre maximum, where the intensity is the same as that due to a single slit, is equal to:

EASY

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 8 - Interference and Diffraction of Light>Objective Problems [Level 2]>Q 8

Two waves of same frequency and same amplitude from two monochromatic sources are allowed to superpose at a certain point. If in one case the phase difference is

0 °

and in other case it is

\frac{π}{2},

then the ratio of the intensities in the two cases will be

EASY

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 8 - Interference and Diffraction of Light>Objective Problems [Level 2]>Q 9

An interference is observed due to two coherent sources separated by a distance

5 λ

along

Y

-axis, where

λ

is the wavelength of light. A detector

D

is moved along the positive

X

-axis. The number of point on the

X

-axis excluding the points

x = 0

and

x = \infty

at which resultant intensity will be maximum, are

In the Young's double-slit experiment, the intensities at two points P1 and P2 on the screen are respectively I1 and I2. If P1 is located at the centre of a bright fringe and P2 is located at a distance equal to a quarter of fringe width from P1 then I1I2 is

Important Questions on Interference and Diffraction of Light

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