33. Geometric Optics
Reflection of Light
33. Geometric Optics Reflection of Light
8PRACTICE PROBLEM
What is the diameter of the lens aperture necessary to achieve proper exposure when a camera's close-up lens is directed towards a portrait located 150 mm in front of the lens, resulting in a focused image on the detector situated 40 mm behind the lens? The required f-number for this exposure is F5.6.
What is the diameter of the lens aperture necessary to achieve proper exposure when a camera's close-up lens is directed towards a portrait located 150 mm in front of the lens, resulting in a focused image on the detector situated 40 mm behind the lens? The required f-number for this exposure is F5.6.