A photographer uses his camera, whose lens has a 50 mm focal length, to focus on an object 1.5 m away. He then wants to take a picture of an object that is 30 cm away. How far must the lens move to focus on this second object?

The distance is

Explanation:

From the question we are told that

   The  focal length is  

Generally the lens equation is mathematically represented as  

At  image  distance  u =  1.5 m

=>      

=>

At  image  distance  

=>    

=>    

The distance the lens need to move is evaluate as

c. magnitude and direction

report!

explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."