Question

(111) Why do
Or
(1) What is visible spectrum?
(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.
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Answer 1

Answer:

1.The visible light spectrum is the segment of the electromagnetic spectrum that the human eye can view. More simply, this range of wavelengths is called visible light. Typically, the human eye can detect wavelengths from 380 to 700 nanometers.

2.In the visible spectrum, the red color has the largest wavelength. The red colour is least scattered by fog or dust particles. ... That is why stop signals have red colour.

answer no. 3. in pic