In order to avoid sunlight, which of the following colour combination for an umbrella is most appropriate?

Which one of the following reflects back more sunlight as compared to other?

Which of the following are the primary colours of light?

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

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

The formation of glittering colours in thin foam of soap is the result of which of the following phenomenon –