Concave Lens

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For many centuries of living human beings we have been able to do some remarkable pretty things with lenses. Although we can’t still be very sure how or when the first person which stumbled onto the concept of lense,

It is clear that at some or the other point in the past history, the people of ancient time that are probably from the Near East realized that they could easily manipulate the term light by using a shaped piece of glass. 

Over the later ages or centuries how and for what lens purpose were used began to increase day by day as people started discovering that they could accomplish different things by using differently lens shapes.

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Concave Lens Explained

In addition to making objects which are distant objects that appear nearer that is they use  telescopes, so they could also be used to make objects which are small appear larger and objects which are blurry appear clear that is the magnifying glasses and lens which is corrective lenses. 

The lenses which are used to accomplish these tasks which are discussed above fall into two categories straight away that are of simple lenses: named:

  1. Concave

  2. Convex Lenses.

A lens which is concave is a type of lens that possesses at least one surface that is curved inwards. It is a lens which is diverging in nature that means that it spreads out the rays of light that have been refracted through it.

A lens which is said to be a concave lens is thinner at its centre than at its edges and is used to correct the problem of short-sightedness which is also known as the myopia. The writings of the famous Pliny the Elder that is in 23–79 makes mention of what is arguably of the earliest use of lenses which are corrective in nature. And then we can say that according to Pliny, Emperor Nero it was said to watch a game of gladiatorialism by using an emerald, that is we can presumably say a concave shaped to correct for the problem of myopia.


Define Concave Lense 

A lens that is an optical transmissive device that focuses or we can say disperses a beam of light by means of a process called refraction. 

A lense which is called a simple lens mainly consists of a single piece of material which is transparent in nature. 

While a lense which is called as the compound lens consists of several simple lenses or we can say the elements and are usually arranged along an axis which is common. 

Lenses are particularly made from materials that are plastic or glass. 

And are polished or ground or we can also say molded to shapes which are desired. 

A lens can focus the ray of  light to form an image that is  unlike a prism which actually refracts light without focusing at all. 


History of Concave Lense 

The word lens is derived from the word lēns. It is a Latin word which names the lentil, that is because a lense which is double-convex is lentil-shaped. 

The plant lentil also gives its name to a figure which is geometric.

Some of the scholars even argued that the evidence which is from archeological age indicates that there was a very widespread use of lenses in antiquity that spanned several millennia. 

Other people have even suggested that Egyptian or certain hieroglyphs depict simple glass lense meniscal.

The earliest reference which is supposed to the use of lenses is from Aristophanes' play that is the Clouds we can say 424 BC mentioning a glass which is  burning. Pliny the Elder that is the 1st century itself confirms that glasses which are burning were known in the Roman period. 

Pliny also has told us the earliest known reference of corrective lenses when he mentions that Nero was said to watch the games of gladiatorial using an emerald that is presumably concave to correct for nearsightedness that is though the vague reference. Both seneca and the Pliny which are the Younger that is the 3 BC–65 AD described the magnifying effect of a glass globe which was filled with water.


Biconcave Lense 

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Lenses are said to be classified by the curvature of the two surfaces which are optical surfaces. A lens is said to be a biconvex or we can say the double convex or just even convex if both of the surfaces are convex. 

A lens with two of the concave surfaces is said to be a biconcave or just we can say concave. If one of the surfaces is flat then the lens is said to be a plano-convex or we can say the plano-concave totally depending on the curvature of the other surface. A lens with one of the convex and another one concave side is said to be a convex-concave or the meniscus. 

It is this lense type that is most commonly used in lenses of corrective visions.

FAQ (Frequently Asked Questions)

Q1. What Happens When We Look Through a Lense Which is a Concave Lens?

Ans:  A lense which is or the concave lens makes light ray parallel diverges that is spread out so that they appear to come from a point which is  behind the lens which is the focal point. The distance which is from the center of the lens to that of a focal point is again said to be the focal length of the lens.

Q2. Which Type of Image is Formed By Using a Concave Lens?

Ans: The Convex lense which is the converging lens can form either real or the images which is  virtual images suppose cases 1 and 2, respectively in books  whereas concave which is the diverging lens can form only virtual images. Real images are always inverted in nature, but they can be either smaller or larger than the object.

Q3. What is the Use of a Concave Lens?

Ans: The lens which is Concave type Lenses are basically for the Nearsighted that is the Convex for the Farsighted. The lense which is Concave lenses are used in eyeglasses that correct nearsightedness. because the distance between both the eye's lens and that of the retina in nearsighted people is longer than it should be as compared to other people. Such people are said to be unable to make out objects which are distant.

Q4. Does a Lens Which is Concave in Nature Make Images Smaller?

Ans: A mirror which is a plane mirror cannot do this thing. but a convex mirror and a lense which is diverging always do this. A mirror which is concave in nature and a converging lens can produce an image which is upright and an image which is reduced in size but it can never produce one which is both upright and in size reduced.