Question

The ratio of intensity at the centre of a bright
fringe to the intensity at a point distant one fourth of
the distance between two successive bright fringes will
be​

Answer 1

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12th

Physics

Wave Optics

Young's Double Slit Experiment

The ratio of intensity at t...

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Asked on December 30, 2019 by

Pranavsai Rai

The ratio of intensity at the centre of bright fringe to the intensity at a point distant one-fourth of the distance between two successive bright fringes will be:

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ANSWER

I=I

max

cos

2

(

2

ϕ

)

ϕ at one-fourth of the distance between two successive

Bright fringes is

4

2π

=π/2

So, I=I

max

cos

2

(

2

ϕ

)

=I

max

cos

2

(

2

π/2

)

=I

max

cos

2

(

4

π

)

=I

max

(

2

1

)

2

(∵cos(π/4)=1/

2

)

=I

max

(

2

1

)

So,

I

I

max

=

2

I

max

I

max

=

1

2

.

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