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 travels more slowly through the transparent materials than through a vacuum , so , the light bends as it enters or leaves the glass .

Fiber optic light transmission

Fiber optic light transmission

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 .

Most materials are opaque , When the  light strikes an opaque object none of it passes through ,  most of the light is either reflected by the object or absorbed and converted to heat .

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 .

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