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JEE Advanced

IMPORTANT

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Assertion: Fraunhofer diffraction occurs when all the rays passing through a narrow slit are approximately parallel to one another.

Reason: Fraunhofer diffraction pattern can be achieved by placing the screen far from the slit.

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Important Questions on Interference and Diffraction of Light

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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

Assertion: In Young's double-slit experiment, often both the phenomena interference and diffraction are present.

Reason: Diffraction results due to the superposition of wavelets from different points of some wavefront.

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 10

Assertion: In the diffraction phenomenon, different maxima have different intensities.

Reason: In interference, different maxima have the same intensities.

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 1

A light source, which emits two wavelengths

λ_{1} \equiv 400 nm

and

λ_{2} \equiv 600 nm

, is used Young's double slit experiment. If recorded fringe widths for

λ_{1}

and

λ_{2}

are

β_{1}

and

β_{2}

and the number of fringes for them within a distance

y

on one side of the central maximum are

m_{1}

and

m_{2}

respectively, then

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 2

Two beams,

A

and

B

of plane polarised light with mutually perpendicular planes of polarisation are seen through a Polaroid. From the position when the beam

A

has maximum intensity (and beam

B

has zero intensity), a rotation of Polaroid through

30 °

makes the two beams appear equally bright. If the initial intensities of the two beams are

I_{A}

and

I_{B}

respectively, then

\frac{I_{A}}{I_{B}}

equals

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

The diagram below shows, two sources $A$ and $B$ , vibrating in phase, in the same uniform medium and producing circular wave fronts.

Question Image

Which phenomenon occurs at point $P ?$

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

Two coherent monochromatic beams of intensities

I

and

4 I

respectively are superposed. The maximum and minimum intensities in the resulting pattern are

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

A fringe width of a certain interference pattern is

β = 0.002 cm

. What is the distance of

5 th

dark fringe from centre?

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

The diameter of the objective of a telescope is

200 cm

. What is the resolving power of a telescope? (Take, the wavelength of light

= 500 \overset{o}{A}

)

Assertion: Fraunhofer diffraction occurs when all the rays passing through a narrow slit are approximately parallel to one another. Reason: Fraunhofer diffraction pattern can be achieved by placing the screen far from the slit.

Important Questions on Interference and Diffraction of Light

Learn and Prepare for any exam you want !

Assertion: Fraunhofer diffraction occurs when all the rays passing through a narrow slit are approximately parallel to one another.

Reason: Fraunhofer diffraction pattern can be achieved by placing the screen far from the slit.