Assertion: Light from two coherent sources is reaching the screen. If the path difference at a point on the screen for yellow light is 3 λ 2 , then the fringe at the point will be coloured. Reason: Two coherent sources always have constant phase relationship.

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If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.

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If Assertion is true but the Reason is false.

Assertion: Light from two coherent sources is reaching the screen. If the path difference at a point on the screen for yellow light is 3 λ 2 , then the fringe at the point will be coloured. Reason: Two coherent sources always have constant phase relationship.

If Assertion is false but Reason is true.

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Assertion: Light from two coherent sources is reaching the screen. If the path difference at a point on the screen for yellow light is $\frac{3 λ}{2}$ , then the fringe at the point will be coloured.

Reason: Two coherent sources always have constant phase relationship.

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Important Questions on Physics

HARD

General Science>General Science>Physics>Optics

Consider a Young's double slit experiment as shown in figure. What should be the slit separation

d

in terms of wavelength

λ

such that the first minima occurs directly in front of the slit

(S_{1})

HARD

General Science>General Science>Physics>Optics

In a Young's double slit experiment, slits are separated by

0.5 mm

, and the screen is placed

150 cm

away. A beam of light consisting of two wavelengths,

650 nm

and

520 nm

, is used to obtain interference fringes on the screen. The least distance from the common central maximum to the point where the bright fringes due to both the wavelengths coincide is:

HARD

General Science>General Science>Physics>Optics

In the Young's double slit experiment using a monochromatic light of wavelength

λ

, the path difference ( in terms of an integer

n

) corresponding to any point having half the peak intensity is

MEDIUM

General Science>General Science>Physics>Optics

The intensity at the maximum in a Young's double slit experiment is

I_{0}

. Distance between two slits is

d = 5 λ

, where

λ

is the wavelength of light used in the experiment. What will be the intensity in front of one of the slits on the screen placed at a distance

D = 10 d

MEDIUM

General Science>General Science>Physics>Optics

The distance between two coherent sources is

1 mm

. The screen is placed at a distance of

1 m

from the sources. If the distance of the third bright fringe is

1.2 mm

from the central fringe, the wavelength of light used is

HARD

General Science>General Science>Physics>Optics

A beam of mono-energetic electrons, which have been accelerated from rest by a potential

U

, is used to form an interference pattern in a Young's double slit experiment. The electrons are now accelerated by potential

4 U

. Then, the fringe width,

MEDIUM

General Science>General Science>Physics>Optics

In Young's double-slit experiment, in an interference pattern, the second minimum is observed exactly in front of one slit. The distance between the slits is

d

and the distance between source and screen is

D

. The wavelength of the light source used is

EASY

General Science>General Science>Physics>Optics

In a double slit experiment, when light of wavelength

400 n m

was used, the angular width of the first minima formed on a screen placed

1 m

away was found to be

0.2 ° .

What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water?

(μ_{w a t e r} = \frac{4}{3})

EASY

General Science>General Science>Physics>Optics

The interference pattern is obtained with two coherent light sources of intensity ratio,

n

. In the interference pattern, the ratio,

\frac{I_{\max} - I_{\min}}{I_{\max} + I_{\min}}

will be

MEDIUM

General Science>General Science>Physics>Optics

A monochromatic light source

S

of wavelength

440 nm

is placed slightly above a plane mirror

M

as shown below. Image of

S

M

can be used as a virtual source to produce interference fringes on the screen. The distance of source

S

from

O

20.0 cm

and the distance of screen, from

O

100.0 cm

(the figure is not to scale). If the angle

θ = 0.50 \times 10^{- 3}

radians, then the width of the interference fringes observed on the screen is:
Question Image

MEDIUM

General Science>General Science>Physics>Optics

Using monochromatic light of wavelength $λ$ , an experimentalist sets up the Young's double slit experiment in three ways as shown.
If she observes that $y = β^{'}$ , the wavelength of light used is :

Question Image

MEDIUM

General Science>General Science>Physics>Optics

A parallel beam of light is incident on a tank filled with water up to a height of $61.5 mm$ as shown in the figure below. Ultrasonic waves of frequency $0.5 MHz$ are sent along the length of the water column using a transducer placed at the top, and they form longitudinal standing waves in the water. Which of the schematic plots below best describes the intensity distribution of the light as seen on the screen? Take the speed of sound in water to be $1, 500 m s^{- 1}$ .
Question Image

MEDIUM

General Science>General Science>Physics>Optics

In Young’s double-slit experiment, the distance between the two identical slits is

6.1

times larger than the slit width. Then the number of intensity maxima observed within the central maximum of the single-slit diffraction pattern is :

EASY

General Science>General Science>Physics>Optics

Young's double slit experiment is first performed in air and then in a medium other than air. It is found that

8^{t h}

bright fringe in the medium lies where

5^{t h}

dark fringe lies in air. The refractive index of the medium is nearly

HARD

General Science>General Science>Physics>Optics

In Young's double-slit experiment, the distance between slits and the screen is

1 m

and monochromatic light of wavelength

600 nm

is being used. A person standing near the slits is looking at the fringe pattern. When the separation between the slits is varied, the interference pattern disappears for a particular distance

d_{0}

between the slits. If the angular resolution of the eye is

\frac{1}{60} °

, then the value of

d_{0}

is close to

HARD

General Science>General Science>Physics>Optics

In a Young’s double slit experiment, the separation between the slits is

0.15 m m

. In the experiment, a source of light of wavelength

589 n m

is used and the interference pattern is observed on a screen kept

1.5 m

away. The separation between the successive bright fringes on the screen is:

MEDIUM

General Science>General Science>Physics>Optics

In a double – slit experiment, at a certain point on the screen the path difference between the two interfering waves is

\frac{1}{8} t h

of a wavelength. The ratio of the intensity of light at that point to that at the center of a bright fringe is:

HARD

General Science>General Science>Physics>Optics

Electrons accelerated from rest by an electrostatic potential are collimated and sent through a Young's double slit experiment. The fringe width is

ω .

If the accelerating potential is doubled, then the width is now close to:

MEDIUM

General Science>General Science>Physics>Optics

In a double-slit experiment, the two slits are

1 mm

apart and the screen is placed

1 m

away. A monochromatic light of wavelength

500 nm

is used. What will be the width of each slit for obtaining ten maxima of double-slit within the central maxima of a single-slit pattern?

MEDIUM

General Science>General Science>Physics>Optics

In a Young's double slit experiment slit separation

0.1 m m,

one observes a bright fringe at angle

\frac{1}{40} r a d

by using light of wavelength

λ_{1} .

When the light of wavelength

λ_{2}

is used a bright fringe is seen at the same angle in the same set up. Given that

λ_{1}

and

λ_{2}

are in visible range

(380 n m t o 740 n m),

their values are:

Assertion: Light from two coherent sources is reaching the screen. If the path difference at a point on the screen for yellow light is 3λ2 , then the fringe at the point will be coloured. Reason: Two coherent sources always have constant phase relationship.

Important Questions on Physics

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Assertion: Light from two coherent sources is reaching the screen. If the path difference at a point on the screen for yellow light is $\frac{3 λ}{2}$ , then the fringe at the point will be coloured.

Reason: Two coherent sources always have constant phase relationship.