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50 mirrorwith lights

A lens is a clear object, usually made of glass or plastic, which is used to refract, or bend light. Lenses can concentrate light rays (bring them together) or spread them out. Common examples of lenses include camera lenses, telescope lenses, eyeglasses, and magnifying glasses. Lenses are often double lenses, meaning they have two curved sides. A convex lens is rounded outward, while a concave lens curves inward. (A great way to remember this is that a concave lens creates an indent like a cave!)

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24 x50 mirror

Magnifying power is inversely related to the focal length of a lens: the bigger the focal length, the lower the magnifying power. The LDDV is a constant number, as it usually tends to be the same for people with good vision. Focal length and LDDV have to be measured in the same units for the calculations to work out—they’re usually measured in meters (or centimeters).

The distance of distinct vision is usually somewhere around 10 cm for a person with perfect vision. Magnifying lenses with shorter focal lengths will have greater magnifying power.

Bookmark this to easily find it later. Then send your curated collection to your children, or put together your own custom lesson plan.

50x 40mirrorwith Frame

Where Mp is Magnifying power, LDDV is the least distance of distinct vision you found in step 7, and Lf is the focal length of the lens.

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Another feature of lenses is called lens power, very similar to magnifying power, and is expressed in the following relationship:

Magnifying power is how much larger a given lens can make an image appear. This is a direct relationship between the focal length of the lens and the least distance of distinct vision, or LDDV. The LDDV is the closest your eyes can comfortably look at an object.

The center axis through a lens is called the principal axis. On lenses that concentrate light rays, the point at which the rays meet, the focal point, is located on the principal axis. The distance the focal point is from the surface of a lens is called the focal length of a lens, and is important when determining the magnifying power of devices like magnifying glasses.

Single order of Large Mirrors may have an extra charge if shipped outside Toronto & GTA due to the fragility of Glass mirror. Contact us for details.For local Toronto and GTA deliveries, our crew will deliver inside your home on the main floor, driveway or garage

We provide curbside delivery only, freight companies with skidded orders or large boxes will deliver with tail-gate on curbside, driveway or garage lane, depending on accessibility.