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The focal length of converging lens is measured for violet, green and red colours. It is respectively fv, fg , fr. We will get
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- fv = fg
- fg > fr
- fv < fr
- fv > fr
Correct Option: C
According to Cauchy relation
| μ = A + | + | .... Hence f ∝ λ | ||
| λ2 | λ4 |
∴ Red light has wavelength greater than violet light. Therefore focal length of lens for red is greater than for violet. (fr > fv)
