What is the light behaviour through different media ?
The light waves
The light is an electromagnetic wave , It is a form of energy that can travel freely across space , where the light rays travel through the vacuum present in the form of wave , when travel in the transparent medium present in the form of particles .
The light transmits through different media with variable degrees , So , Media can classified according to their ability to allow the light to pass through , into transparent medium , translucent ( semi-transparent ) medium , and opaque medium .
The transparent medium
The transparent medium is the medium which permits most light to pass through , the objects can be seen clearly through transparent medium , the materials like the air , the pure water , the glass cup and the clear glass in a window are called transparent .
The transparent medium transmits all visible light , the color of a transparent object depends on the color of light that transmits , So , If red light passes through a transparent object , the emerging light is red .
Although the water is a transparent medium , we can not see fish at the bottom of the sea as the thickness of the water at that point ( the bottom ) is large enough to prevent the light to pass through , By increasing the thickness of the transparent medium , the quantity of light that passes through it decreases .
The translucent medium
The translucent medium is the medium which permits only a part of light to pass through and absorbs the remaining part , the objects can be seen through translucent medium less clearly than the transparent one .
The materials like frosted glass and some plastics , flint glass and tissue paper are called translucent objects , when the light transmits the materials , only some of the light passes through them .
The light does not pass directly through the materials , It changes the direction many times and it is scattered as it passes through , so , we cannot see clearly through them .
The objects on the other side of a translucent object appear fuzzy and unclear , As the translucent objects are semi-transparent , some ultraviolet rays can go through them , this is why a person behind a translucent object can get a sunburn on a sunny day .
The opaque medium
The opaque medium is the medium that does not permit the light to pass through , and the objects can not be seen through the opaque medium .
The materials such as the wood , the stone , the metals, the plant leaves , the foil paper , the milk , the book , the cartoon , the human skin , and the black honey ( molasses ) are opaque to visible light .
The cartoon is an opaque medium because it does not permit the light to pass through and the objects can not seen behind it .