A pair of complementary colours consists of a primary colour and a secondary colour that mix to give white light - Leaving Cert Physics - Question h - 2020

One example of a pair of complementary colours is blue and yellow. These colours combine in additive colour mixing to create white light. Another example includes red and cyan. Similarly, green and magenta also form a complementary pair. These combinations demonstrate the relationship between primary and secondary colours in the context of light mixing.