# Plz ans 1st two questions

$\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\phantom{\rule{0ex}{0ex}}u=-20cm\phantom{\rule{0ex}{0ex}}f=-25cm\phantom{\rule{0ex}{0ex}}\frac{1}{v}=\frac{1}{f}-\frac{1}{u}=\frac{-1}{25}+\frac{1}{20}\phantom{\rule{0ex}{0ex}}\frac{1}{v}=\frac{-4+5}{100}\phantom{\rule{0ex}{0ex}}v=100cm\phantom{\rule{0ex}{0ex}}magnification=-v/u=-100/-20=+5\phantom{\rule{0ex}{0ex}}Itisvirtualerect\phantom{\rule{0ex}{0ex}}Forfurtherquerieskindlyaskinanotherthread.\phantom{\rule{0ex}{0ex}}REGARDS$

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