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Question

In chromatic aberration of a convex lens, :
  1. the image of a straight object becomes wavy.
  2. the image of a white object become colored and blurred.
  3. both A and B
  4. none of the above

A
the image of a straight object becomes wavy.
B
both A and B
C
the image of a white object become colored and blurred.
D
none of the above
Solution
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The correct option is B the image of a white object become colored and blurred.
Chromatic aberration, also known as “color fringing” or “purple fringing”, is a common optical problem that occurs when a lens is either unable to bring all wavelengths of color to the same focal plane, and/or when wavelengths of color are focused at different positions in the focal plane. Chromatic aberration is caused by lens dispersion, with different colors of light travelling at different speeds while passing through a lens. As a result, the image can look blurred or noticeable colored edges (red, green, blue, yellow, purple, magenta) can appear around objects, especially in high-contrast situations.

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