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"Lens in Life" Lens and its Application PPT Courseware 5
do you know? Let’s see who knows more!
1. What is the lens in front of the camera?
2. Why can the same camera take panoramic and non-panoramic images?
3. Sometimes the image taken is very white, and sometimes the image taken is very dark. What is going on?
4.What are the main parts of a camera?
5. How were the photos obtained?
<1>, camera
1. Composition
Lens: Equivalent to a convex lens.
Film: Equivalent to a "light screen", images can be formed on the film.
Focus ring: adjust the distance from the lens to the film (image distance)
Shutter: Used to control exposure time.
Aperture: Controls exposure.
Camera Obscura: Prevents film (photographic negative) from being exposed to light.
2. Principle:
When the object distance is greater than twice the focal length, the convex lens forms an inverted, reduced real image.
3. Camera imaging memory skills:
The real image and the object are tilted sideways,
The near image of the object becomes larger and the far image becomes larger (take a close-up shot and extend the lens forward)
The near image of distant objects becomes smaller. (Taking long shots, zooming back)
2. Projector (slide projector)
1. Composition
Concave mirror: reflects light and condenses it to make it more concentrated.
Light source: Increase brightness.
Threaded lens: equivalent to a convex lens, which concentrates light on the transparent film.
Lens: Equivalent to a convex lens.
Plane mirror: changes the propagation direction of light, thereby changing the imaging orientation.
2.Principle:
When the object distance is greater than one focal length and less than twice the focal length, the convex lens forms an inverted, magnified, and real image.
3. Projector imaging memory skills:
The real image is different from the object,
The near and far images of objects become larger,
(The image becomes larger, the projector moves away from the screen, and the lens moves down)
The near image of distant objects becomes smaller.
(The image becomes smaller, the projector moves closer to the screen, and the lens moves up)
The image is largest near the focus.
Knowledge induction
1. Convex lenses can form images, such as _______, ______, and ______ all use convex lenses to form images.
2. The camera lens is equivalent to a __________; the characteristics of the image are ______, ______, _______; at this time, the distance between the object and the lens is _________ than the distance between the image and the lens.
3. The lens of the projector is equivalent to a __________; the characteristics of the image are ______, ______, _______; at this time, the distance between the object and the lens is ______ than the distance between the image and the lens.
4. A magnifying glass is equivalent to a __________; the characteristics of the image are ______, ______, _______; at this time, the object is _____ away from the lens; the object and the image are ______ in the lens.
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"Lens in Life" Lens and its Application PPT Courseware 8:
"Lens in Life" Lenses and Their Applications PPT Courseware 8 Learning Objectives 1. Know the imaging characteristics of cameras, projectors (slide projectors) and magnifying glasses. 2. Understand the main characteristics of real and virtual images of objects. Self-study 1. What are the main parts of a camera? it..
"Lens in Life" Common Optical Instruments PPT Courseware 3:
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"Lens in Life" Common Optical Instruments PPT Courseware 2:
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