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A camera is used to photograph the full moon,which has an angular diameter of 0.53°.The image on the film is 2.3 mm in diameter.What is the focal length of the lens?
Agonist
A chemical or drug that binds to receptors in the brain and activates them, thereby producing a biological response.
Euphoria
A feeling of great happiness or well-being, which can be induced by various factors including success, love, or certain drugs.
Parkinson's Disease
A progressive neurological disorder that affects movement, causing symptoms such as tremors, rigidity, and bradykinesia (slowness of movement).
Dopamine
A neurotransmitter in the brain associated with pleasure, movement, and motivation.
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