Question

When a monochromatic light is incident on a surface separating two media, both the reflected and refracted lights have the same: 

• A. Frequency
• B. Wavelength
• C. Velocity
• D. Amplitude

Hint:

When light transitions between two media, its \textbf{frequency remains constant}, while \textbf{wavelength and velocity change} depending on the medium's refractive index.

Answer 1

The Correct Option is A

Step 1: Understanding the Reflection and Refraction of Light When a monochromatic light wave travels from one medium to another, it undergoes reflection and refraction at the interface. 

Step 2: Property of Frequency in Different Media The frequency of light remains unchanged during reflection and refraction. This is because the frequency of a wave is determined by the source and is not affected by the medium through which it propagates.

 Step 3: Effects on Other Parameters - The wavelength of light changes as it enters a new medium, because the velocity of light varies according to the refractive index of the medium. - The velocity of light also changes due to the medium's optical density. - The amplitude of light may change due to partial reflection and absorption at the interface. Thus, the correct answer is: \[ \mathbf{Frequency} \]