A glass plate 2.50 mm thick, with an index of refraction of 1.40, is placed between a source of light with wavelength 540 nm (in vacuum) and a screen. The source is 1.80 cm from the screen.

How many wavelengths are there between the source and the screen?

(HINT: the wavelength of light inside the glass is different!)

Explanation:

Given:

We know that the refractive index of a medium is given as:

Hence the no. of wavelengths in the glass:

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i just did this and got a 100.

the answer is b i think