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Manoj
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What is Optical Lens ? Empty What is Optical Lens ?

on Tue Jan 15, 2019 6:48 pm
hi
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Abhishek
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on Tue Jan 15, 2019 6:53 pm
In a very basic form, eyes are thought to have first developed in animals around 550 million years ago!
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Abhishek
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on Tue Jan 15, 2019 6:53 pm
You actually see with your brain, not your eyes. Our eyes function like a camera, capturing light and sending data back to the brain.
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Abhishek
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on Tue Jan 15, 2019 6:53 pm
You see things upside down - it is your brain which turns the image the right way up.
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Abhishek
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on Tue Jan 15, 2019 6:54 pm
A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. ... Lenses are made from materials such as glass or plastic, and are ground and polished or molded to a desired shape. A lens can focus light to form an image, unlike a prism, which refracts light without focusing.
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Abhishek
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on Tue Jan 15, 2019 6:55 pm
On average, you will blink approximately 4,200,000 times in a single year.
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Abhishek
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on Tue Jan 15, 2019 6:55 pm
We have two eyeballs in order to give us depth perception – comparing two images allows us to determine how far away an object is from us.
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Abhishek
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on Tue Jan 15, 2019 6:55 pm
Eyes heal quickly. With proper care, it takes only about 48 hours to repair a minor corneal scratch.
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Abhishek
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on Tue Jan 15, 2019 6:55 pm
The world’s most common eye colour is brown.
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Abhishek
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on Tue Jan 15, 2019 6:55 pm
The first blue-eyed person is said to have lived 6,000-10,000 years ago.
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Abhishek
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on Tue Jan 15, 2019 6:56 pm
Even if no one in the past few generations of your family had blue or green eyes, these recessive traits can still appear in later generations.
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Abhishek
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on Tue Jan 15, 2019 6:56 pm
Blue-eyed people share a common ancestor with every other blue-eyed person in the world.
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Abhishek
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on Tue Jan 15, 2019 6:56 pm
During a sight test, health conditions including diabetes and high blood pressure can be detected.[rand][/rand]
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Abhishek
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on Tue Jan 15, 2019 6:56 pm
Research has found that a tie tied too tightly can increase the risk of glaucoma in men.
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Abhishek
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on Tue Jan 15, 2019 6:56 pm
Your eyes start to develop just two weeks after conception.
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Abhishek
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on Tue Jan 15, 2019 6:56 pm
A newborn baby will cry, but not produce any tears. Babies do not produce tears until they are around six weeks old.
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Abhishek
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on Tue Jan 15, 2019 6:57 pm
Newborn babies can see objects about 8-15 inches away most clearly.
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Abhishek
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on Tue Jan 15, 2019 6:57 pm
80% of our memories are determined by what we see.
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Abhishek
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on Tue Jan 15, 2019 6:57 pm
The only cells that survive from the time you are born until death are in your eyes.
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Abhishek
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on Tue Jan 15, 2019 6:57 pm
Eyelashes have an average lifespan of five months.
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Abhishek
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on Tue Jan 15, 2019 6:57 pm
One of the most common cosmetic injuries is poking the eyeball with a mascara wand.
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faizan khan
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on Tue Jan 15, 2019 7:24 pm
An optical lens is a transparent optical component used to converge or diverge light emitted from a peripheral object. The transmitted light rays then form a real or virtual image of the object.

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faizan khan
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on Tue Jan 15, 2019 7:24 pm
Lenses are a good example of transmissive optical components, meaning that they pass or transmit light. Other transmissive components include filters, windows, flats, prisms, beamsplitters, and waveplates, while the opposite category — reflectives (which reflect light rather than transmit it) — include optical mirrors and retroreflectors.

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faizan khan
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on Tue Jan 15, 2019 7:25 pm
Positive lenses cause a collimated beam of light — assuming the beam travels parallel to the lens axis and passes through the lens — to converge or focus on a spot behind the lens. When referring to the image above, biconvex and plano-convex lenses are considered positive.

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faizan khan
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on Tue Jan 15, 2019 7:25 pm
Negative lenses cause a collimated light beam to diverge and spread behind the lens. The two types of concave lenses — biconcave and plano-concave — are negative.

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