Physics · JEE

Interference: Young's double-slit experiment and expression for fringe width, coherent sources and sustained interference of light Mock Test for JEE

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Part of Optics in JEE Main Physics.

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Q1PhysicsUnit 16: Optics

Two coherent monochromatic light beams of intensities

I

and

4 I

are superposed. The maximum and minimum possible intensities in the resulting beam are:

Q2PhysicsUnit 16: Optics

Two independent monochromatic sodium lamps can not produce interference because

Q3PhysicsUnit 16: Optics

Assertion Ratio of maximum intensity and minimum intensity in interference is 25 1. Hence amplitude ratio of two waves should be 3: 2 Reason

\frac{\boldsymbol{I}_{m a x}}{\boldsymbol{I}_{m i n}}=\left(\frac{\boldsymbol{A}_{1}+\boldsymbol{A}_{2}}{\boldsymbol{A}_{1}-\boldsymbol{A}_{2}}\right)^{2}

Q4PhysicsUnit 16: Optics

A mixture of light, consisting of wavelength 590nm and an unknown wavelength, illuminates Young's double slit and gives rise to two overlapping interference patterns on the screen. The central maximum of both lights coincide. Further, it is observed that the third bright fringe of known light coincides with the 4 th bright fringe of the unknown light. From this data, the wavelength of the unknown light is

Q5PhysicsUnit 16: Optics

Calculate the number of fringes.

Q6PhysicsUnit 16: Optics

The maximum number of possible interference maxima, for slit separation equal to twice the wavelength,in Young's double slit experiment is :

Q7PhysicsUnit 16: Optics

In a Young's double slit experiment, constructive interference is produced at a certain point

P .

The intensities of light at

\boldsymbol{P}

due to the individual sources are 4 and 9 units. The resultant intensity at point

\boldsymbol{P}

will be-

Q8PhysicsUnit 16: Optics

Find the fringe width of the fringe pattern

Q9PhysicsUnit 16: Optics

Initially interference is observed with the entire experimental set up inside a chamber filled with air, Now the chamber is evacuated. With the same source of light used, a careful observer will find that.

Q10PhysicsUnit 16: Optics

In Young's experiment with white light, the central fringe is white. If now a transparent film is introduced in the upper beam coming from the top slit, then the white fringe:

Q11PhysicsUnit 16: Optics

In YDSE using monochromatic visible light, the distance between the plane of slits and the screen is

1.7 m .

At point

P

on the screen which is directly in front of the upper slit, maximum path is observed. Now, the screen is moved

50 c m

closer to the plane of slits. Point

P

now lies between third and fourth minima above the central maxima and the intensity at

P

is one-fourth of the maximum intensity on the screen. Find the wavelength of light if the separation of slits is

2 m m

Q12PhysicsUnit 16: Optics

In Young's double slit experiment, the interference pattern obtained with white light will be

Q13PhysicsUnit 16: Optics

A soap bubble has a thickness of

100 n m

and a refractive Index of 1.35 Given that the wavelength of red light is about

700 n m

and that of blue light is

400 n m,

what colour does the bubble appear to be at the point on its surface closest to an observer when it is illuminated by white light?

Q14PhysicsUnit 16: Optics

Two monochromatic (wavelength

=\boldsymbol{a} / \mathbf{5}

and coherent source of electromagnetic waves are placed on the

x

-axis at the point

(2 a, 0)

and

(-a, 0) .

A detector moves in a circle of radius

R(>>2 a)

whose Centre is at the origin. The number of maximas detected during one circular revolution by the detector are:

Q15PhysicsUnit 16: Optics

A plane wave of monochromatic light falls normally on a uniformly thin film of oil which covers a glass plate. The wavelength of source constructive interference is observed for

\lambda_{1}=5000 \stackrel{\circ}{A}

and

\lambda_{2}=10000 A

and for no other wavelength in between. If

\mu

of oil is 1.25 and that of glass is

1.5,

the thickness of film will be

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