Any camera needs visible light to image, so the starting point of the problem is the lens first. All lenses can reflect light well, and the reflected light is very distinctive. Even if the environment is white light, the reflection will be colored (glass has different refractive indexes for different colors of light), because the lens is convex, and the reflection point is much smaller than the incident light. This can be used as an important means to find the camera. The specific search method is also very simple, that is, shine a flashlight on every suspicious camera hole and observe the reflected light.
Mobile phone shooting function to find hidden cameras
Turn off the lights in the room and bathroom, close the curtains, turn on the camera function of the mobile phone and turn around. If a red dot is found, there is a pinhole camera.
(The above answers were published on 2015-10-19. Please refer to the actual situation for the current purchase policy. )
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