A wave is a perturbation in a material from the point the perturbation was produced, to the sorrounding area
The bending of light rays is the result of refraction of light passing through the lens. A converging lens is curved on both sides such that the rays coming out of it come together at a point (converge). The point at which the right rays meet after refraction is called the focal point which is a real in the convex lens.
Answer:

Explanation:
Given that,
The position of a particle is given by :

Let us assume we need to find its velocity.
We know that,

So, the velocity of the particle is
.
The continent located 40n and 100w is North America
Answer:
<u>thermal power stations</u>
Explanation:
these resources are burned to produce the electricity.