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You got 10mm lens and 20mm lens for your telescope What is the difference?
10mm lens is more powerful than the 20mm lens
Why was reflecting telescope invented?
Early lens telescopes were small, expensive, made from delicate glass, and had fringes of violet color around bright objects. People could make mirrors, first of polished metal, then from glass coated with silver, and finally from different glasses coated with aluminum and other chemicals. These mirrors are larger, cheaper, and reflected light without making the color fringes. The reflecting telescope made modern Astronomy possible.
What role does the lens play?
The role of a lens is to converge and or diverge light depending on the shape of the lens.
Which are a characteristic of the lens?
A glass lens can be concave or convex. This shape is what gives glass the properties of a lens by bending the light.
How lens power change with curvature of lens surface?
The lens power increases as the curvature of the lens surface becomes steeper. A lens with a larger radius of curvature will have a lower power, while a lens with a smaller radius of curvature will have a higher power. This relationship is described by the lensmaker's equation, which relates the power of a lens to the refractive index of the lens material and the radii of curvature of its surfaces.
What is a ruby coated lens?
its made of rubies and it covers lens DUHHHH
Is essilor airwear antiglare?
Essilor airwear references their polycarbonate lens material. "antiglare" is a coating that can ( and should ) be applied to the lens
Do photographers use the same kind of coated lens to manipulate color?
yes
What are transition eyeglasses?
The lens on these glasses are clear in low light then transition (or change) to tinted glass in bright light.
What is uncoated glass?
Your question is not perfectly clear, but ... . Glass is commonly coated to improve its scratch resistance, or to help eliminate reflections from the glass surface itself. Spectacle lenses are commonly coated to improve their scratch resistance. Camera lenses are coated to help minimise reflections internal to the lens system. In a building, the window glass may be given a mirror coating (often nickel) or other colour for aesthetic purposes. The glass in my car has been coated to reduce UV transmission, and thus reduce degradation of the interior.
What are some examples of surface defects in spectacle lenses?
* Cracks * Scratches * Peeling (if there is a coating on the lens)
What sort of lens enables a speedy transition from long shots to close ups?
zoom
If the coating on prescription sunglasses is being repaired and the vendor ruins the lens who is responsible?
I'd say the vendor.
Why should you use lens paper only once on microscopes?
If you re-use it you will smear oils from your fingers on the lens. Additionally, dust from previously used paper can destroy the coating.
Which scratch resistent lenses are the most durable for teens?
The lens isn't a specific brand but a coating that is applied to the particular lens that comes with the glasses. The bottom line is that scratch resistence effectiveness is absed off of the chemical and not the lens themselves.
What camcorders can have a fish eye lens?
All of 'em can, even if they're not built in. You'll either need another complete lens assembly or you can just go to your camera store and buy on a lens adapter to convert your existing lens to a `fish-eye'.
Why don't transition lenses get dark in hot weather?
What some people call Transitions, a registered trademark, lens are designed and built to react to light levels. Low light the lens stay transparent, when bright light hits the lens the way the lens are made makes the lens change to the apropriate level of dark in a fraction of a second.
