Home Physics Ray Optics JEE Main 2025 A transparent film of refractive index, 2.0 …
Physics Ray Optics JEE Main 2025 MCQ (Single Correct)

A transparent film of refractive index, 2.0 is coated on a glass slab of refractive index, 1.45.

What is the minimum thickness of transparent film to be coated for the maximum transmission of Green light of wavelength 550 nm. [Assume that the light is incident nearly perpendicular to the glass surface.]

A
137.5 nm
B
275 nm
C
94.8 nm
D
68.7 nm

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Text Solution

Verified by Experts
The correct answer is:
A

For transmitted green light to be maxima, reflected green should be minima.

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