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

Question

because it speeds up, which causes it to bend

because it slows down, which causes it to bend
一x
C
because it hits a dense medium, which causes it to bounce off

because it gets absorbed, which causes it to lessen in intensity

Answer 1

Light refracts when it encounters glass in a lens primarily because it slows down, which causes it to bend.

When light travels from one medium to another (for example, from air to glass), it changes speed due to different optical densities. In glass, which is denser than air, light slows down, resulting in a change in direction—this bending of light is what we refer to as refraction.