Question

OR
What is visible spectrum?
4 (ii) Why is red used as the stopping light at traffic signals?
(iii)Two triangular glass prisms are kept together connected through their
rectangular side. A light beam is passed through one side of the
combination. Will there be any dispersion? Justify your answer.​

Answer 1

Answer:

1)A spectrum is a band of colors formed due the refraction of a light similar to the rays of sun or simply white light. A spectrum like rainbow

2)Red light has a longer wavelength thus having it will scatter very less as compared to any other light therefore being used in signals

3)No there won't be any dispersion cuz the refraction from the first prism will again be refracted into white light by the another prism kept adjacent to the prism from their triangular face

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Answer 2

Answer:

Explanation:

I)the band of coloured components of white beam

II) red is least scattered and could travel even in fog and smoke

III) no because when two prism kept together and light is passed , the second prism emerge the light with first prism , resulting in white light