1Is the direction of the transmitted beam different when a laser beam passes from air to water and from water to air? Explain.
2In your glass slab diagram with an angle of incidence of 30°, measure \( \angle AON \), \( \angle BON' \) and \( \angle CBN_1' \), and write the result.
3What is the length CD called? How is it measured?
4What will be the result when a ray of light is passed through the glass slab with a different angle of incidence?
5What is refraction of light? What causes it?
6Why is water taken to be a denser medium than air?
7Why is the emergent ray from a glass slab parallel to the incident ray?
8A ray makes an angle of 50° with the surface of a glass slab. What is its angle of incidence?
9Draw a diagram of refraction through a glass slab and label the incident ray, refracted ray, emergent ray, the three angles and the lateral shift.
10Does refraction happen only to light, or to other waves as well?