1. What are the different types of waves? Give examples of each type. 2.When light travels from air to glass, the light bends at the interface. What
is the reason for this phenomenon of bending of light at the interface of the
two media?

See explanation

Explanation:

1) There are two main types of waves;

Mechanical waves and electromagnetic waves.

Mechanical waves usually require a medium for propagation, e.g sound, waves on a spiral spring, etc

Electromagnetic waves do not require a medium for propagation e.g microwaves, x-rays etc

2) The phenomenon is known as refraction. Refraction occurs at the boundary between two media because of the change in the speed of a wave as it moves from one medium to another.

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if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask