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Physics
Health Physics
Question | Answer |
---|---|
How do you find focal length? | FL=1/POWER (convex lens has negative power) (concave lens has positive power) |
A lens is placed in front of a light bulb and an image is focused onto a screen. Why doesnt this give the focal length of the lens?? | the lightbulb is not a distant object and the rays will not be parallel |
What precautions should be taken when working with radioactive sources? | handle substance with tongs, point away from body |