Advertisements
Advertisements
प्रश्न
State the cause of dispersion of white light passing through a glass prism. How did Newton show that white light of sun contains seven colours using two identical glass prisms. Draw a ray diagram to show the path of light when two identical glass prisms are arranged together in inverted position with respect to each other and a narrow beam of white light is allowed to fall obliquely on one of the focus of the first prism.
Advertisements
उत्तर
Different colours of light bend through different angles with respect to the incident ray as they pass through a prism. The red light bends the least, while the violet bends the most. Thus, the rays of each colour emerge along different paths and thus become distinct. This is the cause of dispersion of white light passing through a glass prism.
Isaac Newton used two glass prims, with one prism in inverted position to show that white light of the Sun contains seven colours. The set-up has been shown below:-
When white light of the Sun passes through the first prism, it gets dispersed into seven colours. When all the seven colours of the spectrum were passed through the second prism, Newton found a beam of white light emerging from the other side of the second prism. This observation gave Newton the idea that the sunlight is made up of seven colours.
संबंधित प्रश्न
In the formation of spectrum of white light by a prism:
which colour is deviated most?
When a beam of white light is passed through a prism, it splits to form lights of seven colours. Is it possible to recombine the lights of seven colours to obtain the white light again? Explain your answer.
Describe how you could demonstrate that white light is composed of a number of colours.
The seven colours in the spectrum of sunlight in order, are represented as :
Which is optically denser: water or air? Give reason
In which of the following four diagrams is the correct path of a ray of light passing through a glass prism shown ?
While performing the experiment to trace the path of a ray of light passing through a glass prism, four students marked the incident ray and the emergent ray in their diagrams in the manner shown below. 
(A) I
(B) II
(C) III
(D) IV
An object AB is placed in front of a convex lens as shown in fig. 4. Complete the ray diagram and obtain the image formed and state the nature of the image.
The phenomenon of splitting of light into its component colours is ___________ .
Write an Explanation.
Critical angle
