When light travels from a rarer to denser medium, it loses some speed. Does the reduction in speed imply a reduction in the energy carried by the light wave ?

Explanation

To answer the question of whether the reduction in speed of light when it travels from a rarer to a denser medium implies a reduction in the energy carried by the light wave, we can follow these steps:

### Step 1: Understand the relationship between speed, refractive index, and medium
When light travels from a rarer medium (like air) to a denser medium (like glass or water), its speed decreases. The refractive index (µ) of a medium is defined as the ratio of the speed of light in a vacuum (c) to the speed of light in that medium (v). This can be expressed as:
\[ \mu = \frac{c}{v} \]
From this relationship, we can see that if the refractive index increases (as it does when moving to a denser medium), the speed of light in that medium decreases.

### Step 2: Analyze the energy of light waves
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