Energy of Light Wave in Different Media – Rankers Physics

Refraction by Plane Surfaces: Practice Problem & Solution

Assertion (A): When a light wave travels from a rarer to a denser medium, it loses energy. Reason (R): When a light wave travels from a rarer to a denser medium, it loses speed and energy carried by the wave is proportional to its speed.  
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Solution Explained:

To solve this problem, we apply the core principles of Refraction by Plane Surfaces. Understanding the underlying formula is key to arriving at the correct answer below:

The energy of a light wave depends on its frequency \(E=h\nu\), which remains constant when light travels between different media. While the speed changes, the energy does not. Therefore, both assertion and reason are false.

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