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"Exploration - Imaging Laws of Convex Lenses" Common Optical Instruments PPT Courseware 4
teaching objectives:
1: Know the difference between convex lenses and concave lenses; be able to explain the difference between real focus and virtual focus and the optical properties of the two lenses;
2: Be able to make light path diagrams and draw three special light rays.
Imaging rules when object distance is greater than 2f
It forms an inverted, reduced real image, the image is on the opposite side of the object, and the object distance is greater than the image distance.
Its main applications are: cameras, human eyes
The imaging rule when the object distance is equal to 2f
It forms an inverted, equal-sized real image, with the image and the object on different sides, and the object distance equals the image distance.
Its main application is: It is rarely used
Imaging rules for object distances less than 2f and greater than f
It forms an inverted, enlarged real image, the image is on the opposite side of the object, and the object distance is smaller than the image distance.
Its main applications are: slide projectors, microscopes, and movie projectors.
Imaging rules when the object distance is less than f
An upright, enlarged virtual image is formed, the image is on the same side as the object, and the object distance is smaller than the absolute value of the image distance.
Its main applications are: magnifying glasses and reading glasses.
1. It is known that f=10cm. If the object is placed at a distance of 25cm, a ( ), ( ) image of ( ) will be obtained on the light screen.
2. The magnifying glass used by people works on the principle that the distance from the object to the lens ( ) forms an upright, amplified, and virtual image.
3. If you want to get a magnified real image, you should place the object between ( ) and ( ). If you want to get a magnified virtual image, you should place the object within ( ).
4. The camera uses the principle that when the distance from the object to the lens is outside ( ), real images of ( ) and ( ) are formed on the film.
5. Myopia glasses are a ( ) mirror, and flower glasses are a ( ) mirror.
Lenses are divided into two categories:
A type of lens that is thick in the middle and thin at the edges is called a convex lens (convergent lens)
A type of lens that is thin in the middle and thick at the edges is called a concave lens (divergent lens)
Principal optical axis: The straight line connecting the centers of the spheres on both sides of the lens is called the principal optical axis of the lens.
Optical center: There is a special point on the main optical axis of the lens through which the direction of light propagation does not change.
Convex lenses converge parallel light rays parallel to the main optical axis
Concave lenses have a divergent effect on parallel rays parallel to the main optical axis.
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"Exploring the Imaging Laws of Convex Lenses" Light and Eyes PPT Courseware:
"Exploring the Imaging Rules of Convex Lenses" Light and Eyes PPT Courseware Learning Objectives 1. Know the rules of convex lens imaging through experimental exploration 2. Know the working principle of a magnifying glass 3. Preliminary learning to formulate experimental plans and select equipment required for experiments according to the purpose of inquiry 4. Through experiments ..
"Exploring - Imaging Laws of Convex Lenses" Common Optical Instruments PPT Courseware 3:
"Exploring the Imaging Rules of Convex Lenses" Common Optical Instruments PPT Courseware 3 Review the past and learn new things 1. Determine what kind of lens the following lenses belong to 2. Complete the following optical paths and ask questions: Activity: Use the convex lens in your hand to observe some objects around you and see what you find? Teacher introduction ..
"Exploring - Imaging Laws of Convex Lenses" Common Optical Instruments PPT Courseware 2:
"Exploring the Imaging Rules of Convex Lenses" Common Optical Instrument PPT Courseware 2 Object distance: the distance from the object to the center of the lens; Image distance: the distance from the light screen to the center of the lens; Typical exercises: A student placed a lit candle 15cm away from the convex lens At this time, you get a...