Q4 of 27 Page 442

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

The focal length, power and chromatic aberration; These three are not independent of refractive index of a lens, and refractive index is dependent on the wavelength of the light.

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A flint glass prism and a crown glass prism are to be combined in such a way that the deviation of the mean ray is zero. The refractive index of flint and crown glasses for the mean ray are 1.620 and 1.518 respectively. If the refracting angle of the flint prism is 6.0°, what would be the refracting angle of the crown prism?