Which of the following wavelength occur inred part of the spectrum

Options

A. 470 nm
B. 390 nm
C. 680 nm
D. 830 nm

Answer

C

Explanation

Red wavelength – 780 to 622 nm , orange – 622 to 597 nm, yellow 597 to 577 nm, Green 577 to 492 nm, Blue 492 to 455 nm.