# Why does reflection not produce dispersion?

## Why does reflection not produce dispersion?

(There is no dispersion caused by reflection at the back surface, since the law of reflection does not depend on wavelength.) The actual rainbow of colors seen by an observer depends on the myriad of rays being refracted and reflected toward the observer’s eyes from numerous drops of water.

Why does a parallel faced glass slab produce neither deviation nor dispersion?

Why does a parallel faced glass slab neither produce dispersion nor deviation? Answer: The deviation and dipersion produced by the two prisms are equal but in opposite directions. So both the net deviation and net dispersion are zero.

Why spectrum is not formed in glass slab?

This is because a dispersion takes place in prism and light ray is refracted that is they are bent when it passes through one medium at an angle and changes its speed. When the light passes through glass it has two interfaces one entering and other leaving. So the spectrum is formed by prism not by glass.

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### Why does a rectangular glass slab not produce a spectrum?

A glass prism is able to produce a spectrum , which is a patch of light obtained due to dispersion. This is because the opposite refracting faces of a glass prism are not parellal. Thus, a rectangular glass slab is unable to produce a spectrum due to the refracting faces being parellal to each other .

What is parallel glass slab?

Glass slab is a substance or sheet made of a glass material having 3 dimensions that is length breadth and height, it is cuboidal shaped. As we can observe and see below, the refraction or bending of light rays through a glass slab takes place at the two parallel and equal and opposite surfaces.

What is the causes of dispersion?

The phenomenon of splitting of visible light into its component colors is called dispersion. Dispersion of light is caused by the change of speed of light ray (resulting in angle of deviation) of each wavelength by a different amount. The dispersion of a light wave by a prism is shown in the diagram.

#### Why is a spectrum produced in a glass prism?

The light waves are refracted as they enter and leave the prism. The shorter the wavelength of the light, the more it is refracted. As a result, red light is refracted the least and violet light is refracted the most – causing the coloured light to spread out to form a spectrum.

Does glass slab produce spectrum?

A glass prism is able to produce a spectrum when white light passes through it but a glass slab does not produce any spectrum.

What is the cause of dispersion?

## When light passes through a glass slab its wavelength?

Light is refracted when it crosses the interface from air into glass in which it moves more slowly. Since the light speed changes at the interface, the wavelength of the light must change, too. The wavelength decreases as the light enters the medium and the light wave changes direction.

Can a glass slab produce lateral displacement?

Yes, a glass slab will produce lateral displacement. Air is rarer medium while glass is denser medium. When light travels from air to glass, i.e. rarer to denser medium, lights bends towards the normal. This distance of emergent (stretched backwards) and incident ray is called lateral displacement.

What is the cause of dispersion of light by glass prism?

The dispersion of white light occurs because colors of white light travel at different speeds through the glass prism. When white light consisting of seven colors falls on a glass prism, each color in it is refracted by a different angle, with the result that seven colors are spread out to form a spectrum.

### Why doesn’t dispersion occur when light passes through a glass slab?

If the second interface is NOT parallel to the first, as in a prism, the effects of the first interface are NOT reversed and the colors separated at that interface continue along different paths upon leaving the glass. Well, in fact, dispersion does occur when light is passed through a glass slab – it is just harder to observe that way.