"\\frac{n_1}d-\\frac{n_2}f=\\frac{n_1-n_2}R,\\implies"
"f=\\frac{n_2dR}{n_1R-(n_1-n_2)d}=\\frac{1\\cdot 3.6\\cdot 7.8}{1\\cdot 7.8-(1.33-1)\\cdot 3.6}=4.25~mm."
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