A glass plate 3.45 mm thick, with an index of refraction of 1.60, is placed between a point source of light with wavelength 500 nm (in vacuum) and a screen. The distance from source to screen is 2.05 cm. How many wavelengths are there between the source and the screen?

Explanation:

We are given that

Thickness of glass plate=3.45 mm=

Using

Refractive index=

Wavelength in air,

Distance from source to screen=d=2.05 cm=

Wavelength in medium=

Using the formula

Wavelength in medium=

Distance between source and scree except glass plate=

Number of wavelength=

Number of wavelength=

Number of wavelength=

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c) both a and b.