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Yogita Ingle 5 hours ago
Following are the types of mirrors that are most widely used:
Plane mirror: The images formed from a plane mirror are the reflected images in their normal proportions but reversed from left to right. These are the most widely used mirrors.
Convex mirror: These are the spherical mirror that is curved outward and the image obtained is virtual, diminished and erect for a real object.
Concave mirrors: These are the spherical mirror that is curved inward and the image obtained from these mirrors depend on the placement of the object.
Lenses: A lens is a part of a reflecting material like glass or plastic but curved from both sides. Lenses are unlike mirrors that have a reflecting surface only on one side. Depending upon its shape a lens can be categorized as:
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Convex Lens - A Convex Lens is curved outwards. It is thicker in the centre and narrows down at the edges. It merges the light rays passing through it at a certain point. Therefore, it is also called a Converging Lens.
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Concave Lens - A Concave Lens is curved inwards. It has wider edges and a thinner centre. It reflects back the light that travels through it in different directions. Therefore, it is also called a Diverging Lens.
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Yogita Ingle 11 hours ago
Soil is the material found on the surface of the earth that is composed of organic and inorganic material. Soil varies due to its structure and composition.
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Yogita Ingle 2 days, 11 hours ago
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Mirror |
Lens |
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This works on the principle of reflection |
This works on the principle of refraction |
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These are manufactured using materials other than glass or clear plastic |
These are manufactured using materials made up of glass or clear plastic |
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An ideal mirror reflects 100% of light |
An ideal lense refracts 100% of light |
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The uses of mirror can be seen in houses, automobiles, solar appliances etc |
The uses of lenses can be seen in astronomy and scientific industries, medical and research purposes etc. |
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There are two types: concave and convex |
There are of six types of lenses |
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Plane mirrors does not have a focal point |
It has two focal points for each kind of lense |
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Yogita Ingle 3 days ago
Many harmful substances are created during metabolic activities. These substances can prove lethal if not removed from the body in time. Removal of waste from the body is called excretion.
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Insects breathe through the holes on their bodies; these holes are called spiracles. Thus, the exchange of gases in insects takes place through the spiracles.
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Many invertebrates and a significantly smaller number of vertebrates are hermaphrodites. A hermaphrodite possesses both male and female reproductive organs during their life span. Some of these animals self-fertilize, while others require a partner. It is a condition which enables a form of sexual reproduction in which both partners can act as the "female" or "male". Examples: Snails,worms and about 21 families of fish are Hermaphrodites.
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Yogita Ingle 4 days, 7 hours ago
Epiglottis forms the superior border of the glottis . Size of the epiglottis not responsible for the voice type . While swallowing glottis moves downwards
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Silkmoth is a large, white insect. It lays hundreds of eggs which are stored at a suitable temperature. Eggs hatch to produce larvae which are called caterpillar or silkworm. Caterpillar eats and grow and secrets a liquid. Liquids hardens on coming in contact with air and changes into a fine protein thread. Caterpillars cover itself with these fibres and form cocoon.
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