you place your light source 32.0cm away from a converging lens; animage is produ

Question

you place your light source 32.0cm away from a converging lens; animage is produced on a screen 70.0cm behind the lens. What is thefocal length of the lens? What is the magnification of the image?


Sunlight goes through a lens and focuses on a screen 40.0cmaway. What is the focal length of the lens?

Explain: How do you measure the focal length of a diverginglens?


Sunlight goes through a lens and focuses on a screen 40.0cmaway. What is the focal length of the lens?

Explain: How do you measure the focal length of a diverginglens?

Explanation / Answer

distance of the object u = -32 cm distance of the image v = 70 cm from the relation ( 1/ v ) - ( 1/ u ) = ( 1/ f )                         ( 1/ 70 ) - ( 1/ -32 ) = ( 1/ f ) from this foccal length   f = 21.96 cm magnification m = - v / u                        = 2.1875

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