Question:
Focal length of a convex lens will be maximum for
Focal length of a convex lens will be maximum for
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Higher wavelength → lower refractive index → larger focal length.
Updated On: Jan 30, 2026
- yellow light
- violet light
- blue light
- red light
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The Correct Option is D
Solution and Explanation
Step 1: Relation between focal length and wavelength.
The focal length of a convex lens depends on the refractive index of the material.
Refractive index decreases as wavelength increases.
Step 2: Compare wavelengths of colors.
Among visible light, red light has the maximum wavelength.
Hence, refractive index is minimum for red light.
Step 3: Conclusion.
Since focal length is inversely related to refractive index, it is maximum for red light.
The focal length of a convex lens depends on the refractive index of the material.
Refractive index decreases as wavelength increases.
Step 2: Compare wavelengths of colors.
Among visible light, red light has the maximum wavelength.
Hence, refractive index is minimum for red light.
Step 3: Conclusion.
Since focal length is inversely related to refractive index, it is maximum for red light.
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