If light is electrical-magnetic wave than it should penetrate any opaque material?

Question

note electromagnetic wave propagate at very long distance ; note televisoin waves.

since it is said that light does not need a medium to propate;hence it would geothru any medium as if it was not there?

However if its a particle it should make a ripple in the water surface as it hits it(good experiment)

Answer 1

The Electro magnetic radiation passes through a medium depending upon the frequency of the ray, permeability and permittivity of the medium.

It has maximum speed in vaccum. In any othe medium it may be reflected, refracted . The speed in any medium is less than in vaccuum. With in the medium it may be absorbed or may even pass through them.

Xray passes throuh almost any medium.

Radio waves are almost reflected. If enters a meduim it is absorbed easily.