Question

A double slit S1 − S2 is illuminated by a coherent light of wavelength

λ. The slits are separated by a distance d. A plane mirror is placed in front of the double slit at a distance D1 from it and a screen ∑ is placed behind the double slit at a distance D2 from it (figure 17-E2). The screen ∑ receives only the light reflected by the mirror. Find the fringe-width of the interference pattern on the screen.

Answer 1

Answer:

the required fringe width is

2D1+D2λ/ d.

Explanation:

Given:

Separation between the two slits = d

Wavelength of the coherent light =λ

Distance between the slit and mirror =D1.

Distance between the slit and screen = D2.

Therefore,

apparent distance of the screen from the slits,

D=2D1+D2

Fringe width, β=λD/d

=2D1+D2λ/ d

Hence, the required fringe width is

2D1+D2λ/ d.

Answer 2

Answer:

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