Two optically flat glass plates, 16 cm long, are in contact at one end and separ

Question

Two optically flat glass plates, 16 cm long, are in contact at one end and separated by 0.020 mm at the other end. The space between the plates is occupied by oil with index of refraction 1.45. The index of the glass plates is 1.55. The plates are illuminated at normal incidence with monochromatic light, and fringes are observed.
In the situation, the monochromatic light has a wavelength of 580 nm. The number of bright fringes which are visible is closest to:
Situation

Two optically flat glass plates, 16 cm long, are in contact at one end and separated by 0.020 mm at the other end. The space between the plates is occupied by oil with index of refraction 1.45. The index of the glass plates is 1.55. The plates are illuminated at normal incidence with monochromatic light, and fringes are observed.
In the situation, the monochromatic light has a wavelength of 580 nm. The number of bright fringes which are visible is closest to:
A80
B100
C90
D60
E70

Explanation / Answer

B100

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