Which of the following two colors are complementary colors?

What is a blind spot?

Why does the sky appear dark and black to an astronaut instead of blue?

$A$ beam of white light falling on a glass prism gets split up into seven colours marked $1$ to $7$ as shown in the diagram.
$(a)$ The colours at positions marked $3$ and $5$ are similar to the colour of the sky and the colour of gold metal respectively. Is the above statement made by the student correct or incorrect? Justify.
$(b)$ Which of the above shown positions corresponds approximately to the colour of:
$(i)$ a brinjal
$(ii)$ danger signal
$(iii)$ neel (indigo) which is applied to clothes
$(iv)$ orange

When white light is incident on an object and it reflects all its constituent colors,what color does it appear to be?

The peacock blue color is formed by the superposition of which two colors of light?