What is Lens Formula? In optics, the relationship between the distance of an image (v), the distance of an object (u), and the focal length (f) of the lens is given by the formula known as Lens formula. Lens formula is applicable for convex as well as concave lenses. These lenses have negligible thickness.
Conventional cover lenses are generally made of glass. This must be free of streaks and bubbles. However, due to the requirements mentioned previously, the cover lenses are increasingly made of plastic (polycarbonate, PC).
(ii) Convex mirror is used as rear view mirrors in vehicles , the other vehicles are always beyond the 2F of convex lens so we get a diminished and erect image of other vehicle on lens hence lens gives a larger field of view to us , and we can see more vehicles in lens .
The first, the lens optics headlight, is designed so that the filament in the light bulb is placed at or near the focus of a reflector. In these, prism optics molded in the lens refract the light, which spreads it upward and forward to provide the light desired.
A curved mirror can be of two types depending upon the shape of the bulge, namely Convex – which bulges outwards and Concave – which bulges inward. Concave car mirrors are placed on the side-view mirror of the automobile, whereas, the convex car mirrors are placed on the headlight.
For example, the passenger-side rear view mirror on a car is convex. You may have noticed that many of these mirrors say "Objects in mirror are closer than they appear." This is because the objects are made smaller by the mirror, so they appear farther away! Makeup mirrors and dental mirrors are concave mirrors.
Both the center of curvature and the focal point are located on the side of the
mirror opposite the object. As the focal point is located behind the
convex mirror, a
mirror is said to have a negative focal length value.
Uses of Convex Mirror.
| PHYSICS Related Links |
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| structure of the eye and its functions | standard measurement |
Convex mirrors are used as reflectors in street lights because they are able to spread the light over a wide area.
Concave mirrors are used in solar cookers. This is because they are the only type of mirrors that reflect sunlight to a single focal point. If you use a convex mirror for your cooker, it will not work since they do not have a focal point.
Convex mirrors are used inside the buildings, They are also used in making lenses of sunglasses, They are used in the magnifying glass, They are used in securities and they are used in telescopes.
Uses Of Concave Mirror
- Shaving mirrors.
- Head mirrors.
- Ophthalmoscope.
- Astronomical telescopes.
- Headlights.
- Solar furnaces.
Plane mirror also gives erect and virual image . THIS IS BECAUSE PLANE MIRROR DOES PRODUCE AN IMAGE OF THE SAME SIZE AS THE OBJECT. BUT A CONVEX MIRROR PRODUCES A DIMINISHED IMAGE OF THE SAME OBJECT.
- Inside buildings. You might have noticed that large office buildings, stores, hospitals, and other many other buildings have convex mirrors in the corners.
- Sunglasses. We might have used sunglasses many times.
- Vehicle mirrors.
- Magnifying glasses.
- For security purposes.
- Street light reflectors.
Mirrors can be used to reflect light, not just in an effort to make a room appear brighter, but to cut down on electricity costs due to the added brightness. A well placed mirror can enhance your business or your customers' or employees' experiences.
Convex mirrors are used as side view mirrors in a car to see the traffic behind. This is because of the following reasons: The image formed in a convex mirror is highly diminished due to which a convex mirror gives a wide field of view of the traffic behind the vehicle.
