How will the focal length of a converging lens change if it is replaced by one having a greater absolute index of refraction?
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To find the change qualtitatively you can use lenmakers equation
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$\begingroup$ Just replace the refractive indices with new ones $\endgroup$ Commented Mar 3, 2020 at 14:14
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$\begingroup$ I also thought about Lensmaker's equation but wasn't sure. Thank you! $\endgroup$ Commented Mar 3, 2020 at 21:45
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$\begingroup$ I think its worth noticing that if the refractive index of outer medium is greater than that of material of lens it will change its nature.(converging to diverging and vice versa) Also always happy to help :-) $\endgroup$ Commented Mar 5, 2020 at 12:31