Spherical aberration comes from the fact that a spherical lens does not focus pa

Question

Spherical aberration comes from the fact that a spherical lens does not focus parallel rays at a single point. The closer the rays are to the axis of the lens, the better job the lens does of focusing them at one point, but it is never perfect.

Chromatic aberration comes from the fact that different wavelengths of light travel at different speeds through the material of the lens; that is, they have different indices of refraction, a property known as dispersion. This means that a lens, in effect, has different focal lengths for different wavelengths of light.

Consider a lens made to the following specifications: focal length for red light f(red)=19.57cm , focal length for blue light f(blue)=18.87cm
Consider an object 5.000cm tall placed a distance 30.00cm from the lens. Assuming that the object reflects both red and blue light, find the ratio y(red)/y(blue) of the height of the red image to the height of the blue image.

answer y(red)/y(blue)=? answer should be two three significant

Explanation / Answer

x/5 = (f of red)/ D- (f of red) x/5 = 19.57/(30-19.57) y/5 = 18.87/(30-18.87) x/y = 1.11

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