眼镜利用光的折射原理来矫正视力问题。

Eyeglasses correct vision problems by using the principle of ___refraction of light.

光线在通过不同密度的介质时会发生折射。

Light undergoes ___refraction when passing through mediums of different densities.

显微镜通过光的折射来放大微小物体。

The microscope uses ___refraction of light to magnify tiny objects.