Cermin adalah sebuah benda dengan permukaan yang dapa tmemantulkan bayangan benda dengan sempurna. Cermin sangat familiar bagi manusia. 
Cermin Cembung

Cermin cembung bentuknya cembung atau lengkung ke luar. Kalau sobat hitung punya perut buncit mirip dengan itu :D. Kalau sobat lihat kaca spion motor atau mobil, itulah contoh cermin cembung. Cermin cembung fokusnya bernilai negatif. Jadi dalam perhitungan matematisnya nanti f selalu bernilai
negatif. Sifat bayang yang dibentuk cermin cembung selalu maya, tegak, dan diperkecil.

Sifat Sinar yang dipantulkan cermin cembung
1. Sinar datang yang sejajar sumbu utama akan dipantulkan seolah-olah dari fokus

2. Sinar datang yang menuju R akan dipantulkan kembali dari R

3. Sinar datang yang menuju titik fokus akan dipantulkan sejajar dengan sumbu utama

Rumus Cermin Cembung
Rumus atau persamaan cermin cembung mirip seperti cermin cekung hanya saja nilai fokusnya (F) negatif. Untuk rumus perbesaran cermin cembung sama seperti cermin cekung.

 

A convex mirror, fish eye mirror or diverging mirror, is a curved mirror in which the reflective surface bulges toward the light source. Convex mirrors reflect light outwards, therefore they are not used to focus light. Such mirrors always form a virtual image, since the focal point (F) and the centre of curvature (2F) are both imaginary points "inside" the mirror, that cannot be reached. As a result, images formed by these mirrors cannot be projected on a screen, since the image is inside the mirror. The image is smaller than the object, but gets larger as the object approaches the mirror.

A collimated (parallel) beam of light diverges (spreads out) after reflection from a convex mirror, since the normal to the surface differs with each spot on the mirror.

Uses[edit]

The passenger-side mirror on a car is typically a convex mirror. In some countries, these are labeled with the safety warning "Objects in mirror are closer than they appear", to warn the driver of the convex mirror's distorting effects on distance perception. Convex mirrors are preferred in vehicles because they give an upright, though diminished, image. Also they provide a wider field of view as they are curved outwards.

These mirrors are often found in the hallways of various buildings (commonly known as "hallway safety mirrors"), including hospitals,hotels, schools, stores, and apartment buildings. They are usually mounted on a wall or ceiling where hallways intersect each other, or where they make sharp turns. They are useful for people accessing the hallways, especially at locations having blind spots or wherevisibility may be limited. They are also used on roads, driveways, and alleys to provide safety for motorists where there is a lack of visibility, especially at curves and turns.^[1]

Convex mirrors are used in some automated teller machines as a simple and handy security feature, allowing the users to see what is happening behind them. Similar devices are sold to be attached to ordinary computer monitors. Convex mirrors make everything seem smaller but cover a larger area of surveillance.

Round convex mirrors called Oeil de Sorcière (French for "sorcerer's eye") were a popular luxury item from the 15th century onwards, shown in many depictions of interiors from that time.^[2] With 15th century technology, it was easier to make a regular curved mirror (from blown glass) than a perfectly flat one. They were also known as "bankers' eyes" due to the fact that their wide field of vision was useful for security.

Product Specifications :-

• Designed to convert HDMI signal to standard TCP/IP and transimit by Cat5/Cat 6 internet cable .

• Can extends HDMI up to 60 meters for 1080p over one Cat 6E cable 

• Can transmit HDMI signal source from HD STB,DVD,PS3,HDMI display card etc to HD projector, DLP,LCD,LED and other audio visual equipments .

• Apply M-JPEG technology to process image compressing. The loss of image quality is very small 480i@60Hz��480p@60Hz��576i@50Hz��576p@50Hz��720p@50/60Hz��1080i@50/60Hz��1080p@50/60Hz��

• Supported HDMI format: 480i@60Hz, 480p@60Hz, 576i@50Hz, 576p@50Hz, 720p@50/60Hz, 1080i@50/60Hz, 1080p@50/60Hz�

“EZ-P” Setup

Designed for all generation. With “EZ-P” (Eazy-Programming) Technique. everyone can configure the system during star-up without hassle

Alarm Can Speak

The system will can the user informing of the triggered alarm zone with current status of the alarm. The unique designed of the voice guiding will help you through the entire process.

Minimize False Alarm

ViVOS is engineered to minimize false alarm by implementing sensitivity adjustment such as zone response and smart zone features.

Module Expandable

ViVOS-VGI is simple expansion module installation friendly & effortless. Changing of alarm panels or hardware for expansion module is optional

HD Camera 高清摄像机

Still headache on night vision not sharp enough or blurr.
Worry free with the auxiliary IR LED, can capture image up to 80meters in distance, just install
beside camera for better viewing during night vision

Looking for Autogate AC Sliding control panel with reliable function? Yes this is the one
you can count on.
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DC Sliding Gate installed. Stylish,reliable and easy to operate.
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CJS Technology is currently expanding Malacca and Johor area to seek those interested in becoming an Authorised Dealer. Basically our dealer is including lineman, wireman and constructor. But if you are interesting, no matter big or small business, you are welcome to join us.  For further information, please feel free to contact us.

联络：+6016-722 8975