Question

When a thick glass slab is placed over a printed matter the letters appear raised when viewed through the glass slab is due to:

• A. Reflection
• B. Refraction
• C. Diffraction
• D. Dispersion

Answer 1

Answer:

B. Refraction

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.