There are the following optical instruments: cameras, periscopes, slide projectors, dressing glasses, magnifying glasses, dental endoscopes. Into which two categories can they be divided? These two ca

There are the following optical instruments: cameras, periscopes, slide projectors, dressing glasses, magnifying glasses, dental endoscopes. Into which two categories can they be divided? These two categories of (1) periscope is to rely on plane mirrors to change the route of propagation of light, dress mirror is because of the reflection of light, the reverse extension of the reflected rays of light will converge into an imaginary image.

The dentist endoscope is a dentist is the use of teeth in the plane mirror into an equal image, by observing the image to observe the teeth, and make a diagnosis. The principle is the reflection of light.

(2) convex lens imaging law:

U>2f, into an inverted, shrunken solid image, made of cameras.

2f>U>f, inverted, magnified solid image, made of slide projector.

U < f, into an upright, magnified virtual image, made of magnifying glass.

The answer is: (1) the first category: periscope, mirror, dental endoscopy, using the principle of reflection of light made.

(2) the second category: cameras, slide projectors, magnifying glasses, using the principle of refraction of light made.