Which one of the following colours may be obtained by combining green and red colours ?

Which one of the following colours is seen in the middle of a Rainbow?

Which one of the following colours of white light is least deviated by the glass prism?

Which of the following are the primary colours of light?

When a light beam falls on a triangular glass prism, a band of colours is obtained. Which one of the following statements is correct in this regard ?

Which one of the following telescopes contains only mirrors?