Question:
The rays of different colours fail to converge at a point after passing through a thick converging lens. This defect is called
The rays of different colours fail to converge at a point after passing through a thick converging lens. This defect is called
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Logic Tip: "Chroma" means color. Any lens defect involving the separation or failure to converge different colors is a chromatic issue.
Updated On: Apr 28, 2026
- spherical aberration
- distortion
- coma
- chromatic aberration
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The Correct Option is D
Solution and Explanation
Concept:
The refractive index of a material depends on the wavelength (color) of light.
This phenomenon is known as \textit{dispersion}.
Step 1: Dispersion in lenses When white light passes through a lens, different colors refract by different amounts because their refractive indices are different. As a result, each color has a different focal length.
Step 2: Identification of the defect Since different रंग (colors) focus at different points, a single lens cannot bring all colors to the same focus. This defect is called chromatic aberration. Conclusion: \[ \boxed{\text{Chromatic aberration \]
Step 1: Dispersion in lenses When white light passes through a lens, different colors refract by different amounts because their refractive indices are different. As a result, each color has a different focal length.
Step 2: Identification of the defect Since different रंग (colors) focus at different points, a single lens cannot bring all colors to the same focus. This defect is called chromatic aberration. Conclusion: \[ \boxed{\text{Chromatic aberration \]
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