Light Reflectio...

An object is placed on the principal axis of a concave mirror at a distance of $$60\ cm$$. If the focal length of the concave mirror is $$40\ cm$$ then the magnification obtained is equal to:

A lens which is thicker in the middle and thinner at the edges is called a :

The bending of light as it passes from one medium into another is commonly known as

The constant ratio of the sine of angle of incidence to the sine of angle of refraction is also known as:

When light travels from one medium into another it suffers

A ray of light is incident on a medium with angle of incidence i and refracted into a second medium with angle of refraction $$r$$. The graph of $$\sin(i)$$ Vs $$\sin(r)$$ is as shown in the figure. Then the velocity of light in the first medium is ................. times the velocity of light in the second medium.

........ images cannot be caught on a screen.

The expression for the magnification of a spherical mirror in the terms of focal length (f) and the distance of the object from mirror (u) is

If incident rays are converging then in which region does the image appear?

A convex lens forms an image of an object placed $$20 cm$$ away from it at a distance of $$20 cm$$ on the other side of the lens. If the object moves $$5 cm$$ towards the lens, then the image will be :