Question

why is glass invisible?​

Answer 1

Answer:

When light passes from air into glass, it slows down. It's this change in speed that causes the light to reflect and refract as it moves from one clear material (air) to another (glass). ... No reflection and no refraction will take place, and the object will be invisible.

Explanation:

Answer 2

Photons pass through glass because they are not absorbed. And they are not absorbed because there is nothing which "absorbs" light in visual frequencies in glass. You may have heard that ultraviolet photons are absorbed by glass, so glass is not transparent for them. ... Atoms absorb well-defined discrete frequencies.

When light passes from air into glass, it slows down. It's this change in speed that causes the light to reflect and refract as it moves from one clear material (air) to another (glass). ... No reflection and no refraction will take place, and the object will be invisible.

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