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How do we use lenses?
Concave Lens is used:
✔️ to correct myopia eye defects
✔️ to make spectacles
✔️ in peepholes in hotel room doors.
✔️ in the construction of certain types of telescopes.
Convex Lens is used:
✔️ to correct hypermetropia eye defects
✔️ in cameras and digital cameras as optical devices for producing a reduced, true, and inverted image on film.
✔️ in microscopes and telescopes
✔️ to produce a magnified image of an object.
Subtypes of convex lens are:
📌 A bi-convex lens is a basic lens that consists of two convex surfaces in a spherical form with the same radius of curvature.
📌 Plano-convex lenses are positive focal length elements that have one spherical surface and one flat surface
📌 ConConvex lenses are also known as converging lenses since the rays converge after falling on the convex lens.
Subtypes of concave lenses are:
📌 A bi-concave lens have two inward curved surfaces. These lenses have a negative focal length.
📌 A plano-concave lens is an optical lens with one concave surface and one flat surface. It has a negative focal length and can be used for light projection, beam expansion, or to increase the focal length of an optical system.
📌 A concavo-convex lens is a converging lens. This is because it is thicker in the middle and thinner at the edges allowing it to converge all the light that is incident on it.
ℹ️‼️👀 The lens of our eyes is also convex. The inverted image of the item on the retina is formed by the eye lens.
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What is a brief history of sunglasses?
😎 The first sunglasses were invented sometime in 12th century China. They were a crude slab of smoked quartz that was made to block out the light from the sun. The frames were roughly shaped frame to hold them against the user's face.
😎 Around 1430 vision-correcting eyeglasses were darkened and they were introduced into Italy via the Chinese.
😎 In the 18th century, an English optician James Ayscough began experimenting with tinted lenses in spectacles but not to protect from the sun but to improve vision for those with poor or failing eye sight. He believed that by changing the color of the lenses to a blue/green tint, he could correct specific vision impairments.
😎 The modern-type sunglasses appeared in the 20th century. In 1929, a US businessman Sam Foster, put sunglasses into mass production in America.
😎 Since 1970s well-known fashion designers and movie stars escalated the sunglass craze with their brand-name lines.
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⁉️ How fast is terminal velocity of a bullet?
✅ Hatcher calculated that his .30-caliber rifle bullets reached terminal velocity—the speed at which air resistance balances the accelerating force of gravity—at 300 feet per second. You might die from a bullet moving at that speed, but it's unlikely.
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⁉️ How do snakes hear if they dont have ears?
✅ When people and most animals hear, sound waves strike the eardrum and go to the inner ear, which is sensitive to the sound waves or vibrations. Snakes do not have eardrums, but their skins, muscles, and bones carry the sound waves to the inner ears.
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⁉️ Is Greenland larger than Australia?
✅ The Mercator projection portrays Greenland as larger than Australia; in actuality, Australia is more than three and a half times larger than Greenland. As on all map projections, shapes or sizes are distortions of the true layout of the Earth's surface. The Mercator projection exaggerates areas far from the equator.
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⁉️ What does CT stand for in medical terms?
✅ CT, or CAT as they're pronounced, stands for "computerized axial tomography." In a CT scan, the patient lies on a table that slides into a scanning machine. Inside, an x-ray beam rotates around the body while detectors measure how much of the x-rays pass through the tissues and organs, indicating density.
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⁉️ How much does the temperature change with altitude?
✅ Although the actual atmospheric lapse rate varies, under normal atmospheric conditions the average atmospheric lapse rate results in a temperature decrease of 6.4C°/km (3.5F°/1,000 ft) of altitude above ground level. The measurable lapse rate is affected by the moisture content of the air (humidity).
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⁉️ How many teeth does an elephant have?
✅ Elephants usually have 26 teeth: the incisors, known as the tusks, 12 deciduous premolars, and 12 molars. Unlike most mammals, which grow baby teeth and then replace them with a single permanent set of adult teeth, elephants are polyphyodonts that have cycles of tooth rotation throughout their lives.
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⁉️ What is the instrument used to measure earthquakes?
✅ Seismometers are instruments that measure motions of the ground, including those of seismic waves generated by earthquakes, volcanic eruptions, and other seismic sources. Records of seismic waves allow seismologists to map the interior of the Earth, and locate and measure the size of these different sources.
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⁉️ When do ears and nose stop growing?
✅ Bones, stop growing after puberty and muscle and fat cells also stop dividing. But cartilage - that's the plastic-like stuff in ears and noses - cartilage continues to grow until the day you die. Not only does cartilage grow, but the earlobes elongate from gravity. And that makes ears look even larger.
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What is a lens and its types?
ℹ️ A lens is a piece of transparent material that is shaped to bend light rays in a specific way as they pass through it, whether that means causing the rays to converge to or diverge from a specific point.
The word “lens” derives from the Latin word “lentil,” owing to the shape similarities between a converging lens and a legume.
The 2️⃣ types of lenses are:
📍concave lenses with following features
🔎The light is spread out by a diverging lens.
🔎Thinner in the centre than at the edges.
🔎The image is on one side of the lens, while the object is on the other.
🔎The focal length is positive.
🔎The image will be erect, virtual, and diminished.
and
📍convex lenses with following features
🔍The refracted rays are converged by a converging lens.
🔍Thicker in the centre than at the edges.
🔍The object and the image are both on the same side of the lens.
🔍The focal length is negative.
🔍The resultant image will be both real and inverted.
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How progressive lenses were invented ?
The first patent for a design of progressive addition lenses (PAL) was obtained by Owen Aves in England in 1907. However, because of the limitations in manufacturing in those times, he was never able to produce and commercialize such lenses.
In the first half of the 20th century some other designs for progressive lens were patented but never successfully commercialized.
👓 ❗️The first progressive with a modern design was patented by Bernard Maitenaz ⬆️ of France, in 1953.
The progressive lens has been evolving since then, with the help of manufacturers to improve usability and distortion-free viewing.
ℹ️ Progressive lenses are a giant leap in lens technology since they allow the wearer the ability to see distance, intermediate, and near fields all in one set of eyewear. This is especially helpful for viewing digital devices since they reside in the intermediate range, which distance and bifocal eyeglasses cannot reach ⬆️.
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⁉️ What are the only two mammals that lay eggs?
✅ Only two kinds of egg-laying mammals are left on the planet today—the duck-billed platypus and the echidna, or spiny anteater. These odd “monotremes” once dominated Australia, until their pouch-bearing cousins, the marsupials, invaded the land down under 71 million to 54 million years ago and swept them away.
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⁉️ Why is the wedding ring worn on the ring finger?
✅ According to a tradition believed to have been derived from the Romans, the wedding ring is worn on the left hand ring finger because there was thought to be a vein in the finger, referred to as the 'Vena Amoris' or the 'Vein of Love' said to be directly connected to the heart.
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⁉️ How long can a Nile crocodile hold its breath?
✅ They normally dive for only a few minutes, but will stay underwater for up to 30 minutes if threatened, and if they remain inactive they can hold their breath for up to two hours.
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⁉️ Why are the nuclei of some atoms unstable?
✅ In some atoms the binding energy is not strong enough to hold the nucleus together, and the nuclei of these atoms are said to be unstable. Unstable atoms will lose neutrons and protons as they attempt to become stable
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⁉️ Are doves and pigeons the same thing?
✅ Pigeons and doves constitute the bird family Columbidae, which includes about 310 species.
Pigeons and doves are stout-bodied birds with short necks, and short slender bills (and in some species, these bills feature fleshy ceres). They primarily feed on seeds, fruits, and plants. This family occurs worldwide, but the greatest variety is in the Indomalaya and Australasia ecozones.
In general, the terms "dove" and "pigeon" are used somewhat interchangeably. Pigeon is a French word that derives from the Latin pipio, for a "peeping" chick, while dove is a Germanic word that refers to the bird's diving flight.
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⁉️ Are sea cucumbers animals or plants?
✅ Sea cucumbers are part of a larger animal group called Echinodermata, which also contains starfish and sea urchins. Their body shape is similar to a cucumber, but they have small tentacle-like tube feet that are used for locomotion and feeding.
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⁉️ Which river rises in the Black Forest and flows into the Black Sea?
✅ The river rises in the Black Forest Mountains of Germany and flows eastward into the Black Sea. The Danube River is an important international waterway, flowing through or forming a part of the borders of ten countries and through major cities such as Vienna, Bratislava, Budapest, and Belgrade.
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⁉️ Do sharks have tongues?
✅ Sharks have a tongue referred to as a "basihyal". The basihyal is a small, thick piece of cartilage located on the floor of the mouth of sharks and other fishes. It appears to be useless for most sharks with the exception of the cookiecutter shark.
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