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Question:

What's the difference between the focus and zoom of the flashlight?

What's the difference between the focus and zoom of the flashlight?

Answer:

The difference between focus and zoom of a flashlight is that the spotlight of the zoom torch is adjustable.
Flashlight fixed focus, that is, focal length is fixed, can not be adjusted.
beam without focus, a focus (focus light intensity, is the most bright); the focus of the light ball distance can adjust the focal distance to get.
when the luminous beads in spherical focus, the reflected light beam emitted in parallel, the spot size theory and light; when the luminous beads deviate from a sphere of focus the light, is not parallel, there were divergent beams,
There is a battery powered flashlight through the bulb and the focusing mirror, focusing mirror spherical mirror is made according to the principle of spherical reflector

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