Question

A 5cm tall object is placed 4cm in front of a converging lens that has a focal length of 8cm. Where is the image located in _____ cm? a. -8 cm b. -4 cm c. -5 cm d. -2 cm

Answer 1

a. -8 cm

Step-by-step explanation:

`d_(o)` = distance of the object = 4 cm

`d_(i)` = distance of the image = ?

`f` = focal length of the converging lens = 8 cm

using the lens equation

`(1)/(d_(o)) + (1)/(d_(i)) = (1)/(f)`

`(1)/(4) + (1)/(d_(i)) = (1)/(8)`

`d_(i)` = - 8 cm