Question

Срочно!!!Лінзи окулярів мають фокусну відстань 0,5 м. Посередині лінзи тонше , ніж по краях . Яка оптична сила кожної лінзи? Яка вада зору у власника окулярів?​

Answer 1

Ответ:

-2 дптр у власника короткозорість

(смотрела в интернете)

Answer 2

Focal Length and Optical Power of the Lenses

The lenses of the eyeglasses have a focal length of 0.5 m. The focal length is a measure of how strongly the lens bends light. It is the distance between the lens and the point where parallel rays of light converge or diverge after passing through the lens. In this case, the focal length is 0.5 m, which means that the lens bends light in such a way that parallel rays of light converge or diverge at a distance of 0.5 m from the lens.

The optical power of a lens is a measure of its ability to bend light. It is the reciprocal of the focal length and is measured in diopters (D). The formula to calculate the optical power of a lens is P = 1/f, where P is the optical power in diopters and f is the focal length in meters. In this case, the optical power of each lens can be calculated as follows:

P = 1/f = 1/0.5 = 2 D

Therefore, each lens has an optical power of 2 diopters.

Vision Defect of the Eyeglass Owner

Based on the information provided, the lenses of the eyeglasses are thinner in the middle than at the edges. This indicates that the eyeglass owner has a condition called myopia, also known as nearsightedness. Myopia is a common vision defect where distant objects appear blurry, while close objects can be seen clearly.

In myopia, the eyeball is longer than normal or the cornea is too curved, causing light to focus in front of the retina instead of directly on it. This results in a blurred image for distant objects. The thinner middle part of the lenses helps to diverge the incoming light rays, compensating for the excessive focusing power of the eye and allowing the light to focus properly on the retina.

To correct myopia, concave lenses are used. These lenses are thinner at the edges and thicker in the middle, which helps to diverge the incoming light rays and move the focal point back onto the retina, allowing distant objects to be seen clearly.

In summary, the optical power of each lens is 2 diopters, and the eyeglass owner has myopia, a condition where distant objects appear blurry.