# Two optically plane glass strips of length 10 cm are placed one over the other.A thin foil of thickness 0.01 mm is introduced between them at one end to form an air film. - Applied Physics 2

Numerical

Two optically plane glass strips of length 10 cm are placed one over the other.A thin foil of thickness 0.01 mm is introduced between them at one end to form an air film.
If the light used has wavelength 5900 Ao,find the separation between consecutive bright fringes.

#### Solution

tan  α  = t/l

=( 0.01 xx 10^(−3))/(0.1)

= 10^(-4)  "radian"

β = λ/(2μ α )
= (5.9 xx 10^(−7))/(2 xx 1 xx 10^(−4))

= 2.95 x 10-3
= 2.95 mm

The separation between consecutive bright fringes is 2.95 mm

Concept: Diffraction of Light
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