Physics

What is unreal image? If some rays emitted from a point get reflected or refracted in a plane and then that 2nd point is known as the unreal image of the first point.

What is the relation between the focal length and radius of curvature of a mirror? The focal length of the mirror is half of the radius of curvature.

Define the main axis of a mirror? The straight line across the pole and the center of curvature of a mirror is known as the main axis of a mirror.

What is the center of curvature? The center of the sphere of which the mirror is a part, is known as the center of curvature.

What is the main focus of a spherical mirror? After reflection, if light rays parallel to the main axis of a spherical mirror joins a point (convex mirror) or seems to converge from a point (concave mirror), then that point is known as the main focus of a spherical mirror.

What do you mean by a coating of silver? To make a mirror, one surface of the glass mirror is coated with mercury or silver. This process is known as silvering.

What do you mean by real image? If some light rays emitted from a point get reflected or refracted in a plane and if they meet in a second point, then that 2nd point is known as the real image of the first point.

Explain fluid friction. When an object moves in a fluid, i.e. a liquid or gas, the friction acts is called fluid friction. We have to overcome a barrier in water while swimming in the pond. This barrier is the fluid friction. A parachute works by harnessing the air resistance. The air resistance is a type … Read more