Question:
When a beam of white light is allowed to pass through convex lens parallel to principle axis, the different colors of light converge at different point on the principle axis after refraction. This is called
When a beam of white light is allowed to pass through convex lens parallel to principle axis, the different colors of light converge at different point on the principle axis after refraction. This is called
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Different colours have different refractive indices, so they focus at different points.
Updated On: Oct 1, 2026
- scattering
- chromatic aberration
- spherical aberration
- polarisation
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
The refractive index of glass is different for each colour (higher for violet, lower for red). So a lens bends colours by different amounts and they come to focus at different points on the axis.
Step 2: Name of the effect:
This is chromatic aberration.
Scattering is the spreading of light by small particles. Spherical aberration is caused by the shape of the lens surface, where rays far from the axis focus at a different point, even for a single colour. Polarisation restricts the vibration of light to one plane.
Final Answer:
This defect is chromatic aberration, option (B). \[ \boxed{\text{Chromatic aberration}} \]
The refractive index of glass is different for each colour (higher for violet, lower for red). So a lens bends colours by different amounts and they come to focus at different points on the axis.
Step 2: Name of the effect:
This is chromatic aberration.
Scattering is the spreading of light by small particles. Spherical aberration is caused by the shape of the lens surface, where rays far from the axis focus at a different point, even for a single colour. Polarisation restricts the vibration of light to one plane.
Final Answer:
This defect is chromatic aberration, option (B). \[ \boxed{\text{Chromatic aberration}} \]
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