Answer to Question #181079 in Optics for Gaige Cooper

Question

An object is placed in front of a covering lens with a focal length of 17.50 CM. Find the image distance for an object distance of 35.00 cm. Answer in units of cm.

Answer 1

Solution:-

given

u = - 35 cm

f = 17.5 cm

lens formula

$\frac{1}{v} - \frac{1}{u}=\frac{1}{f}$

$\frac{1}{v} =\frac{1}{u}+\frac{1}{f}$

Putting values

$\frac{1}{v} =\frac{1}{-35}+\frac{1}{17.5}$

$\frac{1}{v} =\frac{-5+10}{175}$

$\boxed{V = 35cm}$ i.e image distance