Two Very Flat Glass Plates,16 Cm Long,are in Contact at One

question 37

Multiple Choice

Two very 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 refractive index of the glass plates is 1.55.The plates are illuminated at normal incidence with monochromatic light,and fringes are observed.When the monochromatic light has a wavelength of 580 nm,how many bright fringes are visible in the pattern?

• A)60
• B)70
• C)80
• D)90
• E)100

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