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Why should the lens of a normal eye be fatter to look at near objects and thinner to look at distant objects?
The muscles around the lens of your eye push and pull it thicker and thinner to focus your eye on an object depending on the distance from your eye to the object. The focal length of a fat lens is shorter than the focal length of a thin lens (the light rays are bent more sharply) When you focus binoculars, you are adjusting their focal length
Are rays perpendicular to the principal axis of a concave mirror converge at or near the focal point?
It should be parallel. Rays "parallel to the principle axis of a concave mirror converage at or near the focal point.
Is a solar furnace dangerous?
Provided you are nowhere near the focal point of the furnace then they are perfectly safe.
Galileo determined that all objects in free fall near the surface of the earth?
Because up to that time, everybody knew that heavy objects obviously fall fasterthan light objects do, and obviously hit the ground sooner than light objects do,except that everybody was wrong.
Would a shadow be longer noon in winter or noon in summer?
the shadow would be longer in the winter i couldn't tell you why, though
What is the relation of focal length of eye with its curvature?
The curvature of the eye's lens is related to its focal length: a more curved lens will have a shorter focal length, which allows the eye to focus on near objects. Conversely, a less curved lens will have a longer focal length, allowing the eye to focus on distant objects.
What is near far focal point?
The near and far focal points refer to distances at which light rays are brought into focus by a lens or mirror. The near focal point is where light rays converge when the object is closer than the focal length. The far focal point is where light rays converge when the object is beyond the focal length.
Why should the lens of a normal eye be fatter to look at near objects and thinner to look at distant objects?
The muscles around the lens of your eye push and pull it thicker and thinner to focus your eye on an object depending on the distance from your eye to the object. The focal length of a fat lens is shorter than the focal length of a thin lens (the light rays are bent more sharply) When you focus binoculars, you are adjusting their focal length
How does the focal length of eye changes from a near object to far object?
When you're looking at a near object, the light rays converge at a point behind the retina so the focal length of your eye increases so that the parallel rays of light converge on the back of the retina. Therefore, if you're looking from a near object to a far object, the focal length of your eye should decrease back to its normal, relaxed size.
What is the name of the internal structure of the eye that forces images to see far and near?
The structure responsible for focusing images to see far and near is called the lens. The lens changes its shape to adjust the focal length, allowing the eye to focus on objects at different distances.
What is accommodation in physics?
The ability of the eye to adjust its focal length is known as accommodation. Since a nearby object (small dobject) is typically focused at a further distance (large dimage), the eye accommodates by assuming a lens shape that has a shorter focal length
What is the magnifying power?
The magnifying power refers to how many times larger an object appears when viewed through a magnifying lens or instrument. It is calculated by dividing the focal length of the lens by the focal length when the object is at the near point of distinct vision (25 cm). This ratio determines the magnification level of the lens.
How do bifocals help us today?
Bi means two, focal means to focus, so Bifocal glasses help you with both short sight and long sight.
What is the X in digital camera zooms?
The lens of a digital camera has a certain focal length, expressed in mm. For example, a 50mm lens has a field of view that approximates what we see with our eyes looking straight ahead. A 25mm wide-angle lens has a field of view that approximates what we see with our eyes when we turn our head from side to side. The shorter the focal length of a lens, the wider the field of view. The longer the focal length of a lens, e.g. 300mm, the narrower the field of view. Of course, a narrow field of view is equivalent to zooming in to a far object, like when we look into binoculars. A lens can either have a fixed focal length, e.g. 25mm, 50mm, 300mm, etc. or can have a range of focal lengths, e.g. 25mm - 100mm, 50mm - 300mm, etc. A lens that has a range of focal lengths is called a zoom lens. The zoom factor of the lens is calculated by dividing the maximum focal length by the minimum focal length. That zoom factor is the "X" you are referring to. For example: 1. A 25mm - 100mm lens is a 100/25 = 4x zoom lens. 2. A 50mm - 300mm lens is a 300/50 = 6x zoom lens. 3. A 50mm - 200mm lens is also a 200/50 = 4x zoom lens. 4. A 100mm - 400mm lens is also a 400/100 = 4x zoom lens. So knowing the zoom factor of a lens alone does not tell you what its minimum and maximum focal lengths are. Both examples 1, 3 and 4 above are 4x zoom lenses, but example 1 has a minimum focal length that is a wide-angle and allows us to take wide landscape shots or include all our classmates in one shot. Example 4 has a maximum focal length that is a long telephoto and allows us to bring far object near.
Where is the image of the near object that seeing formed?
The image of a near object is formed behind the retina in the eye. This occurs when the lens fails to adjust its focal length enough to bring the object into focus on the retina, causing the image to appear blurry.
Are rays perpendicular to the principal axis of a concave mirror converge at or near the focal point?
It should be parallel. Rays "parallel to the principle axis of a concave mirror converage at or near the focal point.
What is the orbit time around the earth?
Near the surface of the Earth, the time for an orbit is about one and a half hours. As objects (satellites) get farther, they would take longer for an orbit.Near the surface of the Earth, the time for an orbit is about one and a half hours. As objects (satellites) get farther, they would take longer for an orbit.Near the surface of the Earth, the time for an orbit is about one and a half hours. As objects (satellites) get farther, they would take longer for an orbit.Near the surface of the Earth, the time for an orbit is about one and a half hours. As objects (satellites) get farther, they would take longer for an orbit.
