"Exploration - Imaging Laws of Convex Lenses" Common Optical Instruments PPT Courseware 2

Description

"Exploration - Imaging Laws of Convex Lenses" Common Optical Instruments 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

When a classmate placed a lit candle 15cm away from the convex lens, he got a reduced image on the light screen. When the candle is 9cm away from the lens, a magnified image is obtained on the light screen. The focal length of this convex lens may be ( )

A. 10 cm B． 8 cm C. 6 cm D. 4 cm

Solution: When u=15cm, it is a reduced real image

∴u＞2f　15 cm＞2f　f＜7.5 cm

It is also known that when u=9cm, it is an enlarged real image

∴＜9 cm＜2f＞9cm＞f＞4.5 cm

Combining the two inequalities, we get: 4.5cm＜f＜7.5 cm

Answer:C

1. The sunlight from infinite distance strikes the convex lens vertically, then ( )

A. Imaged at 2x focal length

B． image in focus

C. image in focus

D． No imaging

2. When a student is doing a convex lens imaging experiment, if he finds an inverted magnified image on the light screen 20cm away from the lens, then the focal length of this lens may be ( )

A. 6cmB. 10cm

C. 25cm D. unconfirmed

3. Use a round fish tank or a transparent can to raise fish, and watch the fish in the tank from the side. The fish you see is ( )

A. physical object

B． Equally large real image

C. magnified real image

D． enlarged virtual image

4. Place an object in front of a convex lens, so that the object distance is 6cm, 18cm and 24cm, respectively, to obtain an enlarged virtual image, an enlarged real image and a reduced real image respectively. Then the focal length f of the convex lens satisfies the relationship ( )

A. f<6cm

B． 6cm

C. 9cm

D． 18cm

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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 4:

"Exploring the Imaging Laws of Convex Lenses" Common Optical Instrument 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 be able to Draw three special lights...

"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 ..

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Update Time: 2024-07-22

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