"Eyes and Glasses" Lenses and their applications PPT

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"Eyes and Glasses" Lenses and their applications PPT

Part One: Preview Perception

1. Eyes

1. Structure (as shown in the picture).

2. Imaging principle.

The function of the lens and cornea is equivalent to a ____________, which concentrates the light from the object on the __________ to form an image of the object.

3. Bright vision distance.

The photopic distance of the eye refers to the distance at which the eye can most ________ without ________ when observing nearby objects. The photopic distance of a normal eye is about __________cm. The far point of a normal eye is at infinity, and the near point is about __________cm.

2. Myopia and its correction

1. Phenomenon.

I can only see __________ objects clearly, but I can't see __________ objects clearly.

2. Reason.

The lens is too thick, the refractive power is __________, or the eyeball is at ____________________.

3. Results.

Image on the retina__________.

4. Correction.

Wear_______________.

3. Hyperopia and its correction

1. Phenomenon.

I can only see __________ objects clearly, but I can't see __________ objects clearly.

2. Reason.

The lens is too thin, the refractive power is __________, or the eyeball is in __________.

3. Results.

Image on the retina__________.

4. Correction.

Wear__________.

Eyes and Glasses PPT, Part 2: Interactive Classroom Understanding

Myopia, hyperopia and their correction

[Example] Students study very hard. Many students’ vision has changed, which affects their study and life and needs correction. Please choose the correct one from the two pictures below: correcting myopia is __________, correcting hyperopia is __________. (Choose "A" or "B" for both)

Analysis: Myopia is caused by the image being formed in front of the retina, so the light entering the eye needs to be diffused to make the light converge on the retina. Therefore, a concave lens should be worn to correct myopia, as shown in picture B; hyperopia is caused by the image being formed in the retina. It is formed behind the eye, so the light entering the eye needs to be concentrated so that the light can converge on the retina. Therefore, a convex lens should be worn to correct hyperopia, as shown in picture A.

Answer: B A

Eyes and Glasses PPT, Part 3: Try the Application

1. Eyes

1. The light from the object passes through the lens and converges on the retina to form an image of the object. Which of the following statements is wrong ()

A. The lens is equivalent to a convex lens

B. The retina is equivalent to a light screen

C.The image formed is a real image

D. The image formed is upright relative to the object

This question tests students' understanding of the imaging rules of convex lenses. The lens in the eyeball is equivalent to a convex lens, which can present the image of distant objects on the retina, and adjust the size of the image by adjusting the convexity of the lens, so A, B, and C are correct. According to the imaging rules of convex lenses, real images are all inverted, so D is wrong. The object we see is upright because after the eyes transmit the image information to the brain, the brain adjusts the image and turns it into an upright image.

2. The human eye is like a camera. The light emitted from the object is refracted by the lens and then imaged on the retina. The image formed on the retina ()

A. Inverted, enlarged real image B. Upright, reduced virtual image

C. Inverted, reduced real image D. Upright, enlarged virtual image

2. Myopia, hyperopia and their correction

3. (2018 Heilongjiang Suihua High School Entrance Examination) In recent years, the proportion of primary and secondary school students wearing glasses has increased significantly. Which of the following statements about the causes and correction of myopia and hyperopia is correct ()

A. Myopia is imaged behind the retina and corrected with a convex lens

B. Hyperopia is imaged behind the retina and corrected with a concave lens

C. Myopia is imaged in front of the retina and is corrected with a concave lens

D. Hyperopia is imaged in front of the retina and is corrected with a convex lens

4. As shown in the figure, the lens that can be used to correct myopia is ()

Myopia is caused because the lens is too thick and has too strong refractive power, causing light to converge prematurely and be imaged in front of the retina. The light entering the eye needs to be diffused so that it converges on the retina, and a concave lens has a divergent effect on the light. A concave lens is a lens that is thin in the middle and thick at the edges.

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For more information about the PPT courseware "Lens and Its Applications in Eyes and Glasses", please click the "Lens and Its Applications ppt Eyes and Glasses ppt" tag.

"Eyes and Glasses" Lenses and Their Applications PPT download:

"Eyes and Glasses" Lenses and Their Applications PPT Download Part 1: Knowledge Points Basic Knowledge Point 1 Eyes 1. The human eye is like a magical camera. The lens and cornea work together to act as the camera lens (convex lens), retina Equivalent to taking a photo...

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Update Time: 2024-10-05

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