The phenomena of dispersion of sunlight into its component colours is due to the inclined refracting surface of the glass prism. A glass slab lacks the inclined surface and the required peculiar shape . Thus, white light does not split into different colours when it passes through a glass slab.
Why white light does not disperse in glass slab?
As the second interface is parallel to the first interface, the seven colors of light emerge out and combine again to form white light . Hence, the dispersion does not occur in glass slab.
What happens when white light passes through glass slab?
However when white light passes through a glass slab, it suffers refraction at the first surface, and splits into its component colored rays . At the second surface these colored rays suffer reflection and are reversed back to the first surface, undoing the effect of the first surface.
Why does glass slab does not produce spectrum?
But when these dispersed colors of light emerge from the opposite face of the glass slab, the emerging rays of light again combine with each other to form white light as the refraction does not deviate these seven colors. Hence, the light emerging from the second face of the glass slab does not produce any spectrum.
Can a glass block disperse light?
White light can be split up to form a spectrum using a prism . This is a block of glass with a triangular cross section. Light waves are refracted as they enter the glass because they are slowed down.
Why dispersion of light does not occur in vacuum?
This phenomenon takes place because waves of different wavelength move with same speed in vacuum but with different speeds in a medium . Therefore, the refractive index of a medium depends slightly on wavelength also.
Can a glass slab bend different?
No, a glass slab cannot bend different colored lights by different angles . This is because the two opposite sides of the glass slab are parallel.
When white light is incident on a glass slab and images after refraction it does not form a spectrum?
Answer: This is because the light has refracted for two times inside the slab and the spectrum which has been formed with first refraction has again converted into white light through the phenomenon of Recombination when it refracted by the second portion.
What happens when a ray of light hits a glass block at 90 degrees?
Direction of bending
When a ray of light passes from a less dense material (eg air) into a denser material (eg glass or water) it is bent away from the surface between the two materials. ... However, if the ray of light hits the surface at right angles (ie at 90°) to the surface, the ray is not bent .
Which light bends the most when white light is incident on a glass prism?
When white light incident on a glass prism, the emergent light is seen to be consisting of several colors(violet, indigo, blue, green, yellow, orange and red). The red light bends the least, while the violet light bends the most(as shown in figure).
Why do we get the spectrum of colors when white light passes through a glass prism?
As light passes through a prism, it is bent, or refracted, by the angles and plane faces of the prism and each wavelength of light is refracted by a slightly different amount. ... As a result, all of the colors in the white light of the sun separate into the individual bands of color characteristic of a rainbow.
Why do we get the spectrum of colours when white light passes through a glass prism?
When white light is incident on a prism, the rays corresponding to different colours bend through different angles on refraction . ... Each colour emerges through the prism along a different path and becomes distinct. Hence, we get a spectrum of seven colours.
Why is there no dispersion of light refracted through a rectangular glass slab?
After refraction at two parallel faces of a glass slab, a ray of light emerges in a direction parallel to the direction of incidence of white light on the slab. As rays of all colours emerge in the same direction (of incidence of white light), hence, there is no dispersion, but only lateral displacement.
What color is the least bent?
Consequently, violet light is bent the most while red light is bent the least. This separtion of white light into its individual colors is known as dispersion of light.
Which Colour refracts the most?
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. This is called dispersion .
Which Colour is most dispersed?
Red has the highest wavelength and violet the lowest. Wavelength is inversely proportional to the deviation in the path of the light. Red light suffers the least amount of deviation and violet the most.
