Read the following statements carefully(i) The prism behaves same as that of rectangular glass slab. (ii) All the colours have different angles of deviation in case of dispersion through prism. (iii) All the colours travel with the same speed of light in glass. (iv) Dispersion of light is observed in case of rectangular glass slab.Which of the above statement/s is true?
(A) Only (ii)
(B) (i) and (ii) only
(C) (i), (ii) and (iv) only
(D) All of the above
Answers
Answer:
(B) (i) and (ii) only
Explanation:
(III) all colours couldn't travel with the same speed of light in glass
all the colors only travel with same speed of light in space and air medium
(iv) dispersion of light in case of rectangular slab could not be observed because Since the glass slab is rectangular, these spectra coincide with each other as they exit the other side of the slab, re-forming white light.
1. In the first time, a prism is made up of glass in which the faces are joined at a certain angle.
A rectangular glass slab has opposite faces that are parallel to each other.
As the light enters the prism, all the colors travel with different light speeds because glass is a denser medium than air.
Dispersion of light is not observed in the case of a rectangular glass slab.
So, both the prism and rectangular glass slab behave differently.
2. The second statement is true as the colors have different deviation angles in dispersion through a prism.
3. The third statement is false as different colors have different speeds in a prism.
4. The fourth statement is false as lateral displacement is observed in rectangular glass slabs, not dispersion of light.
Hence, the answer would be A.