51. mmh A camera is supplied with two interchangeable lenses, whose focal lengths are 35.0 and 150.0 mm. A woman whose height is 1.60 m stands 9.00 m in front of the camera. What is the height (including sign) of her image on the image sensor, as produced by (a) the 35.0-mm lens and (b) the 150.0-mm lens?

 

The magnification equation gives us

 

So image height is

And the lens equation tells us

Solve for image distance

 

Or

Now plug that into the image height equation we found

 

 

So for the 35.0 mm lens

 

 

So for the 150.0 mm lens

 

 

For 35.0 mm lens

 

 

For 150.0 mm lens

 

 

Minus sign implies the images are upside down or inverted on negative film

 

 

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This page last updated on July 6, 2018