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A contact lens is a small, shell-shaped piece of eyeware used to correct vision. It is placed directly over the cornea (the transparent, or clear, tissue over the pupil and the iris, or colored part of the eye). There are two types of contact lenses. One is the corneal contact lens which covers only the cornea, and the other is the scleral contact lens, which covers the cornea and a part of the sclera (the white part of the eye).
The contact lens is held in place by fluid attraction forces. These forces are easy to demonstrate. If two pieces of glass are placed together with water between them, it is easy to slide the pieces back and forth. But separating the two pieces of glass is very difficult. Today contact lenses are made from plastics and gels, but the original contact lenses were made of glass blown by glassblowers.
Here akshara is giving the uses of lens but she has not explained what it is made up from ? Lens are made up of Flint glass because it has high refractive index .
Now you must be thinking ..
"What is refractive index ?"
Ans : Suppose a ray of light travelling in air enters into another medium like
water or glass and gets refracted is called the refractive index of that
medium .The refractive index is usually denoted by the symbol n .
What else can I help you with?
What happen when lens is slowly lifted up from glass plate?
As the lens is lifted up from the glass plate, the distance between the lens and the plate increases. This results in the focal point shifting further away from the lens, causing the object to appear blurry. By adjusting the height of the lens, the focus can be controlled to make the object appear sharp again.
What is a fresnel lens?
A Fresnel lens is a type of compact lens that is made up of a series of concentric stepped surfaces rather than a single solid piece of glass. This design allows for the same optical effect as a traditional lens while using less material, making it lighter and more cost-effective. Fresnel lenses are commonly used in lighthouses, traffic lights, and overhead projectors.
Is a magnifying glass a converging lens or a diverging lens?
A magnifying glass is a converging lens because it is thicker in the middle than at the edges, causing light rays passing through it to converge. This convergence allows the lens to magnify and focus images.
What does An achromatic lens consists of?
An achromatic lens consists of a compound lens made up of two or more elements with different types of glass to minimize chromatic aberration. This design allows the lens to focus multiple wavelengths of light to a single point, resulting in improved image quality.
What moves the lens up or down?
In a camera, the lens can be moved up or down using the focus ring or by adjusting the zoom settings, depending on the type of lens being used. This movement helps to change the focus or framing of the shot.
The type of microscopes made up of two or more lens?
doubled lenses
Type of microscope made up of two or more lens?
compound microscope
Type of microscopes made up of two or more lens?
Compound microscopes
The lens you look through magnifies of specimen?
a lens magnifies an object by using the pupal of your eyes and the glass from the lens to look up close. a lens magnifies an object by using the pupal of your eyes and the glass from the lens to look up close.
What happen when lens is slowly lifted up from glass plate?
As the lens is lifted up from the glass plate, the distance between the lens and the plate increases. This results in the focal point shifting further away from the lens, causing the object to appear blurry. By adjusting the height of the lens, the focus can be controlled to make the object appear sharp again.
Why can't you lens in solar furnaces?
You can't lens in solar furnace this is due to Lenses are made up of plastic or glass which may get burnt of change the shape. This will defeat the basic concept of using lenses .
What is the word origin for hand lens?
A hand lens is nothing more than a hand-held magnifying glass. The term "hand lens" is used primarily in a laboratory setting. The lens, or glass, is set into a frame with a handle attached. The fictional Sherlock Holmes popularized the hand lens, or magnifyng glass when looking for clues to solve a mystery.
What is a fresnel lens?
A Fresnel lens is a type of compact lens that is made up of a series of concentric stepped surfaces rather than a single solid piece of glass. This design allows for the same optical effect as a traditional lens while using less material, making it lighter and more cost-effective. Fresnel lenses are commonly used in lighthouses, traffic lights, and overhead projectors.
Is a magnifying glass a converging lens or a diverging lens?
A magnifying glass is a converging lens because it is thicker in the middle than at the edges, causing light rays passing through it to converge. This convergence allows the lens to magnify and focus images.
Type of microscope made up of two or more lenses?
A compound microscope is made up of two or more lenses in its optical system. The objective lens magnifies the specimen, and the eyepiece lens further magnifies the image produced by the objective lens. This combination of lenses allows for higher magnification and resolution compared to simple microscopes.
What is the important properties of glass?
The properties a glass is made up of depends on what type of glass it is. Some properties glasses contain are: silicon dioxide, sodium oxide, and sodium carbonate.
Type of a microscope made up of two or more lenses?
If a microscope has more than one lens, it is called a compound microscope.
