Question

where is the image located when an objectis placed 30cm from a convex lens with a focal length of 10cm?​

Answer 1

Answer:

15 cm

Explanation:

using the thin lens formula for convex lens

                            $\frac{1}{f} = \frac{1}{p} + \frac{1}{q}\\ \\where f = focal length \\ p = object distance \\ q = image distance$

 so,

         $\frac{1}{q} = \frac{1}{f} - \frac{1}{p} \\\\\frac{1}{q} = \frac{1}{10} - \frac{1}{30} \\\frac{1}{q} = \frac{2}{30}\\\frac{1}{q} = \frac{1}{15cm}$

so,

    q = 15 cm