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What are the negative effects of using chemicals?

What are the negative effects of using chemicals? Chemicals are used for different experiments in chemistry. But they can be harmful to humans and the environment when they are not properly used. i) Chemicals are used to keep fish and meat fresh and ripen fruits which is harmful to health. ii) Preservatives are used to preserve different food products which are risky for health. iii) Excessive use of chemical fertilizer harms plants. iv) Different harmful substances enter our bodies through blood by using artificial cosmetics, colors, etc. You may like What is Electrocardiograph? What is biological currency? What is activation energy? What is rate of reaction? What is green chemistry?

Geometrical Optics

Geometrical Optics Notes for Class 11 - 12

Optical path

The path traversed by light in a vacuum at a particular time which is taken by the light to travel a particular distance in any other medium is called an optical path.

Fermat's Principle

When a light ray traverses from one point to other after reflection or refraction it follows a path whose distance will be either maximum or minimum and the time that will be taken for this will be maximum or minimum.

Power of lens

The ability of a lens to converge or diverge a bundle of light rays is called the power of a lens.

The power of a lens having a one-meter focal length is called one diopter. The power of a lens is inversely proportional to its focal length.

Angular magnification

Angular magnification is defined as the ratio of the visual angle produced in the eye by the image of an object formed by a visual instrument to the visual angle produced in the eye directly by the object.


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When you open the gas cylinder used for cooking, which action takes place first diffusion or effusion?