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Maxima & Minima in YDSE

In a YDSE bot...

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In a YDSE both slits produce equal intensities on the screen. A $100 %$ transparent thin film is placed in front of one of the slits. Now the intensity of the geometrical centre of system on the screen becomes $75 %$ of the previous intensity. The wavelength of the light is $6000 \circ A$ and $μ_{g l a s s} = 1.5$ . The thickness of the film cannot be:

A

$0.2 μ m$

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B

$1.0 μ m$

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C

$1.4 μ m$

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D

$1.6 μ m$

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Solution

The correct option is B
$1.0 μ m$

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Similar questions

In a YDSE both slits produce equal intensities on the screen. A $100 %$ transparent thin film is placed in front of one of the slits. Now the intensity of the geometrical centre of system on the screen becomes $75 %$ of the previous intensity. The wavelength of the light is $6000 \circ A$ and $μ_{g l a s s} = 1.5$ . The thickness of the film cannot be:

Y D S E

, both slits produce equal intensities on the screen. A

100 %

transparent thin film is placed in front of one of the slits. Now, the intensity on the centre becomes

75 %

of the previous intensity. The wavelength of the light is

6000 A^{o}

and refractive index of glass is

1.5

The minimum thickness of the glass slab is:

Q. In Young's double slit experiment, two slits of equal intensities produce interference pattern forming central maxima at point

O

. A transparent film

(μ = 1.5)

is placed in front of one of the slits. Now the intensity of light at point

O

75 %

of the intensity of a bright fringe. The wavelength of light used is

6000 ˚ A

. The thickness of the film cannot be,

Q. When a thin transparent sheet of refractive index

μ = \frac{3}{2}

is placed near one of the slits in Young's double slits experiment, the intensity at the centre of the screen reduces to half of the maximum intensity. The minimum thickness of the sheet should be (

λ

is the wavelength of light and both slits are identical)

Q. In a Young's double slit experiment, the slits

S_{1}

S_{2}

are illuminated by a parallel beam of light of wavelength

4000 ˙ A

from the medium of refractive index

μ_{1} = 1.2

. A thin film of thickness

1.2 μ m

and refractive index

μ = 1.5

is placed in front of

S_{1}

perpendicular to the path of light. The refractive index of the medium between the plane of slits and screen is

μ_{2} = 1.4

. If the light coming from

S_{1}

S_{2}

have equal intensity

I

, then the intensity at the geometrical centre of screen

O

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