The speed of the light wave decreases when it moves from the glass back into the air.
<h3>Briefing : </h3>
The speed of light in a medium decreases as the medium's refractive index rises. Since glass has a higher refractive index than air, light will move more slowly in glass and more quickly.
Light travels at a speed of about 300,000 km/s in a vacuum, which has a refractive index of 1, but this speed decreases to 225,000 km/s and 200,000 km/s in water and glass, respectively.
<h3>Why is light faster in air than glass?</h3>
Because air is optically rarer than other materials, light travels there more quickly than in other materials that are denser. And in this instance, glass is a denser medium and air is an optically rarer medium. Light waves will therefore move quickly through the air.
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