Question

Which of the following quantities related to a lens depend on the wavelength of the incident light?

• A. Refractive index
• B. Focal length
• C. Power
• D. Radii of curvature

Answer 1

Answer: (A), (B), (C)

The correct options are
A Refractive index
B Focal length
C Power

The refractive index of any material depends on the wavelength of the light incident on it. Also, the focal length of a lens, depends on its reractive index, so even the focal length depends on the wavelength of the light used. Since, the power of a lens is the inverse of the focal length, it too depends on the wavelength of light used