1. Dry cells are light in weight and small in size. 2. Dry cells can easily carried from one place to another. 3. There is no fear of leakage in the dry cells. 4. They can easily be used to run the simple electrical devices. . . .
A concave mirror is used in the following ways: 1. It is used as a shaving mirror. 2. It is used as a reflector in torches, lighthouses etc.. 3. A dentist uses a concave mirror to obtain a magnified image of the teeth of the patient. 4. In astronomical telescopes, it is used to view magnified images of heavenly bodies. . . .
A convex mirror is used in the following ways: 1. As a rear view mirror in vehicles such a car, bus and truck. 2. In shopping complexes an d large shops to keep an eye on customers and shoplifters. . . .
The human eye has an inbuilt convex lens. When the rays of light fall on the eye lens, it focuses a real and inverted image on the retina, which acts as a screen. The retina is connected to the optic nerves that carry the information to the brain. The brain then interprets the information and form s a real and erect image of the object with the correct . . .
Regular Reflection Reflection that takes place through a regular and smooth surface is known as regular reflection. Irregular Reflection Reflection that takes place through a rough and dull surface is known as irregular or diffused reflection. . . .
Advantages of mercury are: 1. It is opaque and shining. Hence , it is easily visible through the glass. 2. It does not wet the glass. 3. It has a low freezing point and a high boiling point. It can be used over a wide range of temperatures. 4. It is a good conductor of hest, so it quickly absorbs heat to attain the temperature of the o . . .
Our earth is surrounded by a blanket of air called the atmosphere.The atmosphere extends up to nearly 300 km above the earth's surface. This air exerts pressure on everything on the earth. This pressure is called air pressure. Air pressure decreases with increasing altidute, that is, air pressure is more near the surface of the earth and decrease . . .
In hot and humid tropic areas like India, thunderstorms or lightning storms are known to occur. Thunderstorms are storm accompained by heavy rains , lightning, thunder and sometimes even snow and hail. when the air near the earth's surface heats up due to the heat of the sun , it rises upward. As the warm air moves up, it cools and condenses to form . . .