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When a ray of light passes from a denser medium into a rarer medium at the interface, how does the refracted ray behave relative to the normal?
AIt travels along the normal
BIt bends away from the normal
CIt bends towards the normal
DIt is totally reflected back
Answer & Solution
Correct answer: B. It bends away from the normal
1. Light speeds up when moving from a denser to a rarer medium.
2. This change causes the ray to bend away from the normal at the surface.
3. Bending towards the normal happens only in the reverse case (rarer to denser).
4. So the refracted ray bends away from the normal here.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 2 Optics "Refraction of Light", p.24_
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