Question

We can see through a glass.
(a) How can we see through a glass?
(b) In our daily activities, what value can we learn from this property of glass

Answer 1

Glass is transparent so we can see through it.
In our daily activities glass values to us as we have a lot of glass materials in kitchens.
And it looks good compared to other metal.

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