Question

if v = -5 cm and u = -10 cm find f where 1/v+ 1/u = 1/f​

Answer 1

Step-by-step explanation:

$\frac{1}{f} = \frac{1}{v} + \frac{1}{u} \\Solution : \frac{1}{f} = \frac{1}{(-5)} + \frac{1}{(-10)} \\\frac{1}{f} = \frac{(2 +1)}{-10}\\ \frac{1}{f} = \frac{3}{-10} \\ f = \frac{-10}{3} \\f = -3.33 cm$

Note:

if your tr. wants focal length in mm then plz convert it to mm

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