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In the double slit experiment, $5 t h$ dark fringe is formed opposite to one of the slits. The wavelength of light is

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Important Questions on Wave Optics

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Physics>Optics>Wave Optics>Young's Double Slit Experiment

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:

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Physics>Optics>Wave Optics>Young's Double Slit Experiment

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?

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Physics>Optics>Wave Optics>Young's Double Slit Experiment

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:

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Physics>Optics>Wave Optics>Young's Double Slit Experiment

In Young's double slit experiment, the two slits are illuminated by light of wavelength

5890

Å

and the angular distance between the fringes obtained on the screen is

{0.2}^{o}

. If the whole apparatus is immersed in water then the angular fringe width will be, if the refractive index of water is

\frac{4}{3}

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Physics>Optics>Wave Optics>Young's Double Slit Experiment

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:

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Physics>Optics>Wave Optics>Young's Double Slit Experiment

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

EASY

Physics>Optics>Wave Optics>Young's Double Slit Experiment

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

EASY

Physics>Optics>Wave Optics>Young's Double Slit Experiment

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})

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Physics>Optics>Wave Optics>Young's Double Slit Experiment

In a Young's double slit experiment, the slits are placed

0.320 mm

apart. Light of wavelength

λ = 500 nm

is incident on the slits. The total number of bright fringes that are observed in the angular range

- 30^{o} \leq θ \leq 30^{o}

is:

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Physics>Optics>Wave Optics>Young's Double Slit Experiment

In Young's double-slit experiment, using monochromatic light of wavelength

λ,

the intensity of light at a point on the screen where path difference is

λ

K

units. Then, the intensity of light at a point where path difference is

\frac{λ}{3}

EASY

Physics>Optics>Wave Optics>Young's Double Slit Experiment

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

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Physics>Optics>Wave Optics>Young's Double Slit Experiment

A light source, which emits two wavelengths

λ_{1} = 400 n m

and

λ_{2} = 600 n m

, is used in a 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

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Physics>Optics>Wave Optics>Young's Double Slit Experiment

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

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Physics>Optics>Wave Optics>Young's Double Slit Experiment

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

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Physics>Optics>Wave Optics>Young's Double Slit Experiment

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 :

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Physics>Optics>Wave Optics>Young's Double Slit Experiment

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

Physics>Optics>Wave Optics>Young's Double Slit Experiment

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:

MEDIUM

Physics>Optics>Wave Optics>Young's Double Slit Experiment

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

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Physics>Optics>Wave Optics>Young's Double Slit Experiment

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})

EASY

Physics>Optics>Wave Optics>Young's Double Slit Experiment

In Young's double slit experiment the separation

d

between the slits is

2 mm,

the wavelength

λ

of the light used is

5896 Å

and distance

D

between the screen and slits is

100 cm.

It is found that the angular width of the fringes is

0.20 °

. To increase the fringe angular width to

{0.21}^{o}

(with same

λ and D

) the separation between the slits needs to be changed to

In the double slit experiment, 5th dark fringe is formed opposite to one of the slits. The wavelength of light is

Important Questions on Wave Optics

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In the double slit experiment, $5 t h$ dark fringe is formed opposite to one of the slits. The wavelength of light is