4x Why does light refract when it encounters the glass in a lens?

Question

because it speeds up, which causes it to bend
B
because it slows down, which causes it to bend
C
because it hits a dense medium, which causes it to bounce off
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because it gets absorbed, which causes it to lessen in intensity

Answer 1

The correct answer is B: because it slows down, which causes it to bend.

When light passes from one medium (like air) into a denser medium (like glass), it slows down. This change in speed causes the light to change direction, or refract, at the interface between the two media. This bending of light is described by Snell's Law.