Question

what is refractionand how is it useful

Answer 1

refraction- is the bending of light as it travels from one medium to another medium...( for eg - when you dip a pencil in a beaker full of water , you will see that the pencil slightly crooked) ....
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Answer 2

The phenomenon of bending of light at the surface separating two media when it goes from one medium to another is called the refraction of light.

For example u can use this photo.
Hope u will understand...