Question

A camera lens used for taking close-up photographs has a focal length of 23.0 mm. The farthest it can be placed from the film is 34.0 mm. (a) What is the closest object (in mm) that can be photographed

Answer 1

The object distance is 71.09 mm.

Step-by-step explanation:

A camera lens used for taking close-up photographs has a focal length of 23.0 mm, f = 23 mm

The farthest it can be placed from the film is 34.0 mm, v = -34 cm

Using lens formula as follow :

`(1)/(u)-(1)/(v)=(1)/(f)`

`(1)/(u)=(1)/(f)+(1)/(v)\\\\(1)/(u)=(1)/(23)+(1)/((-34))\\\\u=71.09\ mm`

So, object distance is 71.09 mm.