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Convex lens:
1. It is thick in the middle and thin at the edges.
2. It converges the incident rays towards the principal axis.
3. It has a real .
Concave lens :
1. It is thin in the middle and thick at the edges.
2.It diverges the incident rays away from the principal axis.
3. It has a virtual focus.

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What are the differences between the concave lens and convex lens

Posted by Saritha Amma 7 years, 6 months ago

CBSE > Class 07 > Science

1 answers

Gagan Nayak 7 years, 6 months ago

Convex lens 1) It is thicker at the middle and thinner at the edges. 2)It converges the rays of light. 3)Generally forms the real and inverted image. 4)It forms the erect and magnified image. Concave lens 1)It is thicker at the edges and thinner at the middle. 2)It diverges the rays of light. 3)Generally forms virtual and erect image. 4)Forms diminished image.

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How is clayey soil is useful for crops? Mention any three uses.

Posted by Siya Mishra 7 years, 6 months ago

CBSE > Class 07 > Science

2 answers

Yogita Ingle 7 years, 6 months ago

Clayey soil can retain much water and consequently contains lot of moisture even in summer. That’s why it is most useful for crops like paddy which requires lot of water. Clayey soil is useful for wheat also.
Uses of clay soil:
(i) Clay soil is used in making ceramics, or pottery.
(ii) Clay is also used in many industrial processes, such as paper making, cement production, and chemical filtering.
(iii) Clay is also often used in the manufacture of pipes for smoking tobacco.

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Samiksha Gudda 7 years, 6 months ago

Clayey soil is use ful for crops (1) it has more water holding capacity. (2) this soil is rich in humus and is very fertile. (3) it contains useful organic minerals which is suitable for growing ? ??crops

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Why is it necessary to eat roughage

Posted by Bhargabi Chakraborty 7 years, 6 months ago

CBSE > Class 07 > Science

1 answers

Vijay Rajendran 7 years, 6 months ago

For digestion

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What is dialysis

Posted by Sonakshi Bairoliya 7 years, 6 months ago

CBSE > Class 07 > Science

3 answers

Gagan Nayak 7 years, 6 months ago

It is a method of removing toxic substances from body when kidneys are not able to do so.

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Piyush Bansal 7 years, 6 months ago

It is the process of cleaning blood with the help of dialysis machine.it function as an artificial kidney

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Divyansh Kasaudhan 7 years, 6 months ago

Dialysis is the process of filering blood through an artificial way when kidney stop working

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What is aerobic

Posted by Konika Monika 7 years, 6 months ago

CBSE > Class 07 > Science

0 answers

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What are electron ?

Posted by Khushi Gaur 7 years, 6 months ago

CBSE > Class 07 > Science

1 answers

Anish Yadav 7 years, 6 months ago

Electron are those micro pigment by which it allow electricity to pass from a thing

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What are capalaries

Posted by Azman Khan 7 years, 6 months ago

CBSE > Class 07 > Science

2 answers

Gurdeep Singh 7 years, 6 months ago

The artery divides into a network of very thin tubes called as capalaries

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Baljinder Singh 7 years, 6 months ago

The blood vessel which join artery and veins

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What is convex lens

Posted by Gurdeep Singh 7 years, 6 months ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 7 years, 6 months ago

Convex Lens: A convex lens makes the object magnified, when viewed through it. A convex lens is thick in the middle and thin at its edge. When light rays pass through a convex lens, they bend inwards and converge at a common point to form an image of the source of light. Rays from the sun converge to form its image as a bright spot. A convex lens converges light rays. Therefore, it is also called a converging lens. The image formed when the object is placed close to a convex lens is virtual, erect and magnified. Virtual images cannot be caught on a screen. Images that are caught on a screen are called real images. When the object is placed at a distance from a convex lens, the image formed is real, inverted and diminished.

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An ant acid tablet is taken when you suffer from acidity

Posted by Mansi Verma 7 years, 6 months ago

CBSE > Class 07 > Science

1 answers

Xyz Gandhi 7 years, 6 months ago

Because acid help in digesting but to much of acid causes indigestion to decrease the level of acid we take an antacid such as milk of magnesia which contains magnesium hydroxide

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What is harvesting

Posted by Daljit Singh 7 years, 6 months ago

CBSE > Class 07 > Science

2 answers

Nishi Garg 7 years, 6 months ago

Harvesting mens to conserve anything g for use. For example:in water harvesting we conserve water for purposes like washing clothes, utensils, washroom purposes etc....

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Gurdeep Singh 7 years, 6 months ago

The reaping season

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The brightness of the electronic bulb is observe to decrease when an electric heater is connected with it suggest reason

Posted by Dhruv Anand 7 years, 6 months ago

CBSE > Class 07 > Science