Question

Which one has larger wavelength, red or blue light?

• A. Red light
• B. Blue light
• C. Both red and blue have same wavelength
• D. Depends on the source of these light

Answer 1

The correct option is A

Red light

Among the 7 constituent colours of white light, red light has the longest wavelength and violet light has the smallest wavelength. The wavelength of red light is 1.8 times greater than the wavelength of blue light.