Question

if a glass block is placed over a mark on paper the mark seems to rise explain​

Answer 1

Answer:

When a glass block is placed over a mark on a paper, the mark seems to rise due to refraction of light from denser medium to rarer medium at the plane surface separating the two media.

Answer 2

When a glass block is placed over a mark on a paper, the mark seems to rise due to refraction of light from denser medium to rarer medium at the plane surface separating the two media.