An electomagnetic wave is entering from one medium to another. Then the property which remains unaltered is

A light ray travelling from one medium to another me dium is given in the figure.What is a relation between angle of incidence, angle of refraction and refractive index of medium.

………...Is a device which converts energy from one form to another.

When light rays enter from one medium to another, refraction takes place. Consider refraction of light at a spherical surface separating two media of refractive indices n and n_2 (n_2 > n_1) .In the above case let the first medium be air and the second medium glass of refractive index 1.5, R of spherical surface = 20cm. An object is placed in air 100cm from the glass surface. At what position the image is formed?

When light rays enter from one medium to another, refraction takes place. Consider refraction of light at a spherical surface separating two media of refractive indices n_1 and n_2 (n_2 > n_1) . With the help diagram derive refraction formula .

Transfer of genetic material from one bacterium to another through a virus is called