Question

why
does the letter appear to be
raised when viewed through
glass slab placed
placed over
over the document ​

Answer 1

Answer:

because of refraction

Explanation:

The letters appear raised because of a phenomenon known as refraction. When light travels from one medium to another, it bends (either towards or away from the normal). This happens because different media have different densities and thus, the speed of light is different in each one of them