Maria has a bad eyesight and has to wear glasses$($minus$)2$D$.$ She tried to swim underwater wearing the glasses but the vision is not clear. She wiil buy underwater glasses. Compute the optical power she needs $($water on the outside only$)$ and what kind o glasses she needs. n of water$=1\mathrm{.}3$ and n of glass $1,5$

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To calculate the optical power needed for Marias underwater glasses we can use the lensmakers formul... View the full answer