Question

if 2 light beams having intensities I and4I superimposed to make interference fringes of visibility 1/2.find the degree of coherence​

Answer 1

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Physics

Wave Optics

Young's Double Slit Experiment

The interference pattern is...

PHYSICS

The interference pattern is obtained with two coherent light source of intensity ratio n. In the interference pattern, the ratio

I

max

+I

min

I

max

−I

min

will be

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VIDEO EXPLANATION

ANSWER

Given : I

2

=nI

1

Maximum intensity of interference I

max

=(

I

1

+

I

2

)

2

∴ I

max

=(

I

1

+

nI

1

)

2

=(1+

n

)

2

I

1

=(1+n+2

n

)I

1

Minimum intensity of interference I

min

=(

I

1

−

I

2

)

2

∴ I

min

=(

I

1

−

nI

1

)

2

=(1−

n

)

2

I

1

=(1+n−2

n

)I

1

∴

I

max

+I

min

I

max

−I

min

=

2(1+n)

2

n

−(−2

n

)

=

1+n

2

n