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NEET 1997 (AIPMT) · Prism, Dispersion & Scattering

Prism, Dispersion & Scattering question from NEET 1997 (AIPMT)

Q92NEET 1997 · AIPMTEasy

Prism, Dispersion & Scattering

The focal length of converging lens is measured for violet, green and red colours. It is respectively $f_v, f_g, f_r$ . We will get

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Answer: (a)

Lens maker's formula: $\frac{1}{f} = (\mu - 1)\left(\frac{1}{R_1} - \frac{1}{R_2}\right)$ , so larger $\mu$ gives smaller $f$ .
$\mu_v > \mu_g > \mu_r \Rightarrow f_v < f_g < f_r$
So the answer is (a) $f_v < f_r$ .

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