answer the following question in short
Answers
Answer:
ans 9 :- the angle which an incident line or ray makes with a perpendicular to the surface at the point of incidence.
ans 11 :- A simple periscope is just a long tube with a mirror at each end. The mirrors are fitted into each end of the tube as shown in the figure. Hence, there are 2 plane mirrors used which are placed parallel to each other.
ans 7 :- We only see the Moon because sunlight reflects back to us from its surface. During the course of a month, the Moon circles once around the Earth. If we could magically look down on our solar system, we would see that the half of the Moon facing the Sun is always lit.
ans 8 :- Point of incidence: The point on the surface where the incident ray strikes the surface is called the point of incidence. Reflected ray: The ray of light that bounces back from the surface of an object is called a reflected ray of light.
ans 5 :- Potable water, also known as drinking water, comes from surface and ground sources and is treated to levels that that meet state and federal standards for consumption.