When monochromatic red light is used instead | vedclass

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(A) According to Cauchy's dispersion formula, the refractive index of a material depends on the wavelength of light. The refractive index for red ligh

Vedclass · Accepted Answer

increase

Vedclass · Answer

(A) According to Cauchy's dispersion formula, the refractive index of a material depends on the wavelength of light. The refractive index for red light $(\mu_{R})$ is less than the refractive index for blue light $(\mu_{B})$, i.e., $\mu_{R} The lens maker's formula is given by $\frac{1}{f} = (\mu - 1) \left( \frac{1}{R_{1}} - \frac{1}{R_{2}} \right)$.Since $\mu_{R} Consequently, $\frac{1}{f_{R}}  f_{B}$.Therefore, when red light is used instead of blue light, the focal length of the convex lens will increase.

When monochromatic red light is used instead of blue light in a convex lens, its focal length will

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