Physics Camera and Eye Vision Correction Please answer in detail, thank you 3 19 38 16

1) Dad's eyes are farsighted glasses, the glasses are convex lenses, the words are too close to the eyes when reading a book, the object is imaged behind the retina, and the object needs to be pulled closer with a convex lens to make the object exactly on the retina, and when looking at things in the distance, the object distance increases, the image distance decreases, and the object is just imaged on the retina.

2) Take Dad's glasses and look closely at the words on the book, and you will find that the words are magnified. Proof that the lenses on the glasses are convex lenses.

1. Made of convex lens.

Because convex lenses have a converging effect on light. Seeing near with eyes means that when looking close, the eyes do not have enough convergence of light.

2. Turn your eyes directly into the sun. If you can find a very small and bright spot, it proves that it is a convex lens.

Convex. When the glasses are held against the sun, a bright spot appears on a piece of paper.

1 is a convex lens From the title, Xiao Ming's father is a farsighted eye Hyperopia is because the refractive ability of light is too weak, and it falls to the back of the retina through the pupil, so it is difficult to see near objects, which can be solved by wearing a convex lens, so that the light is reflected once first, and then the light falls on the retina through the lens refraction, so that you can see a clear image and the farsighted eye sees distant objects It just falls on the retina, so you look at distant objects and take off your glasses.

2 When you look at sunlight with a convex lens, you can see the smallest and brightest spot of light, which is the focal point, which is the convex lens.

1) Answer: Xiao Ming's father's glasses are convex lenses, because Xiao Ming's father does not use glasses when looking at the distance, but needs glasses when looking close, which means that Xiao Ming's father is farsighted, and the farsighted eye should have a convex lens, so he wears a convex lens.

2) Answer: Touch it with your hands, the middle thickness and the surrounding thin are convex lenses.

Convex. If you don't need glasses to see a distance, it means that he is farsighted, so he needs to wear a convex lens for correction.

Convex lens, because Xiao Ming's father is myopic, myopia needs to be corrected with a convex lens.

1 All 1Cameras are made using the principle that convex lenses can be used to form inverted and reduced real images. Its lens acts as a convex lens, and the light from the object passes through the lens to form an inverted real image on the negative.

2.The eyeball is also a camera, and the lens and cornea work together as a convex lens, which can concentrate light rays from objects on the retina to obtain an inverted, zoomed out real image.

3.Unlike a camera, the eye changes the shape of the lens through the ciliary body, allowing us to see objects in different positions, while a normal camera mainly changes the distance between the lens and the negative, so that objects at different distances can be clearly imaged on the negative.

1: The film is equivalent to the light screen in the experiment, so it is on the film 2: The medium and thin outer thickness is myopia glasses and concave lenses, and the medium thickness and outer thickness are farsighted glasses and convex lensesExplanation: The myopic eye will be in front of the retina, and wearing a concave lens will diverge the light to make the image on the retina.

Farsightedness will be the image in the retina thick, so wearing a convex lens to concentrate the light will make the phase on the retina3: The principle of using a magnifying glass is to magnify the appropriate distance, and if it is too far, it will be blurred Everyone's opinion I am also a student, and I have just finished learning.

1.The camera wants to leave the image on film.

2.Reading the words on the book through glasses, enlarged reading glasses, shrunken myopic glasses.

Through the textbook, the method of measuring the focal length of the convex lens is measured, and the power of the glasses = 100·1 f Explanation: The myopic eye will be imaged in front of the retina, corrected with a concave lens; Hyperopia will be imaged behind the retina with a convex lens.

3.The water cup is equivalent to a convex lens, and the imaging law of the convex lens: the object distance is less than the focal length into a magnified and upright virtual image; The object distance is greater than 1 times the focal length and less than 2 times the focal length is magnified and inverted real image; Object distance greater than 2 times the focal length into a reduced handstand real image.

The law of image change: when the image is real, the object distance becomes smaller, the phase distance becomes larger, and the image becomes larger; When the image is virtual, the object distance becomes smaller, the image distance becomes smaller, and the image becomes smaller.

(1) The camera looks like an upside-down and shrunken real image.

2) Reading glasses are thick in the middle and thin at the edges, and the difference between the middle and edge thickness of the myopia lenses is larger in the middle and thick at the edges, indicating the greater the power.

I think it should be that the height of the mud doll will not change, and the width will change, using the principle of a magnifying glass.