Question

If two coherent waves intensity ratio is 9:4 then the ratio of maximum to minimum intensity of the fringe is​

Answer 1

Answer:

25:1

Given :

I

1

I

2

=

4

9

Maximum intensity I

max

=(

I

1

+

I

2

)

2

Minimum intensity I

min

=(

I

1

−

I

2

)

2

Thus ratio of maximum to minimum intensities

I

min

I

max

=

(1−

I

1

I

2

)

2

(1+

I

1

I

2

)

2

∴

I

min

I

max

=

(1−

2

3

)

2

(1+

2

3

)

2

Or

I

min

I

max

=

(2−3)

2

(2+3)

2

=

1

25