What is the function of the retina in the human eye?

The retina acts as a screen on which the image is formed. It contains light-sensitive cells (rods and cones) that convert light into electrical signals sent to the brain via the optic nerve.

What is myopia and how is it corrected?

Myopia, or near-sightedness, is a vision defect where a person can see nearby objects clearly but cannot see distant objects distinctly. It is corrected using a concave lens of appropriate power.

What is dispersion of light?

The splitting of white light into its component colours (VIBGYOR) when it passes through a transparent medium like a glass prism is called dispersion of light.

Why does the sky appear blue?

The sky appears blue due to the scattering of light by the earth's atmosphere. The fine particles in the air scatter blue light (shorter wavelength) more strongly than red light.

What is accommodation of the eye?

The ability of the eye lens to adjust its focal length to clearly focus on objects at various distances is called accommodation.

What is an ecosystem?

An ecosystem consists of all the organisms and the physical environment with which they interact. These biotic and abiotic components are linked together through nutrient cycles and energy flows.

What are the components of an ecosystem?

The main components of an ecosystem are abiotic (non-living) components like air, water, and soil, and biotic (living) components like producers, consumers, and decomposers.

What is a food chain?

A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another.

A food web is the natural interconnection of food chains and a graphical representation of what-eats-what in an ecological community.

What is the role of decomposers in an ecosystem?

Decomposers break down dead plants and animals into simpler substances, returning essential nutrients to the soil for producers to use.

What is reflection of light?

The phenomenon of bouncing back of light rays into the same medium when they fall on a polished or smooth surface is called the reflection of light.

What are the laws of reflection of light?

The laws of reflection state that: (1) The angle of incidence is equal to the angle of reflection. (2) The incident ray, the normal to the mirror at the point of incidence, and the reflected ray, all lie in the same plane.

What is the nature of the image formed by a plane mirror?

The image formed by a plane mirror is always virtual, erect, of the same size as the object, and laterally inverted.

What is the relation between the angle of incidence and deviation for a plane mirror?

For a plane mirror, the angle of deviation (δ) is given by δ = 180° - 2i, where i is the angle of incidence.

What is reflection of light?

The phenomenon of bouncing back of light rays into the same medium when they fall on a polished or smooth surface is called the reflection of light.

What are the laws of reflection of light?

The laws of reflection state that: (1) The angle of incidence is equal to the angle of reflection. (2) The incident ray, the normal to the mirror at the point of incidence, and the reflected ray, all lie in the same plane.

What is the nature of the image formed by a plane mirror?

The image formed by a plane mirror is always virtual, erect, of the same size as the object, and laterally inverted.

What is the relation between the angle of incidence and deviation for a plane mirror?

For a plane mirror, the angle of deviation (δ) is given by δ = 180° - 2i, where i is the angle of incidence.

What is a chemical reaction?

A chemical reaction is a process in which atoms of reactants are rearranged to form new substances called products. It involves breaking of bonds in reactants and formation of new bonds in products.

What is a balanced chemical equation?

A balanced chemical equation is one in which the number of atoms of each element is equal on both the reactant and product sides, satisfying the law of conservation of mass.

What are the types of chemical reactions?

The main types of chemical reactions are: combination reactions, decomposition reactions, displacement reactions, double displacement reactions, and oxidation-reduction (redox) reactions.

What is the law of conservation of mass?

The law of conservation of mass states that mass can neither be created nor destroyed in a chemical reaction. The total mass of reactants equals the total mass of products.

What is a decomposition reaction?

A decomposition reaction is one in which a single compound breaks down into two or more simpler substances, usually when energy (heat, light, or electricity) is supplied.

What is a chemical reaction?

A chemical reaction is a process in which atoms of reactants are rearranged to form new substances called products. It involves breaking of bonds in reactants and formation of new bonds in products.

What is a balanced chemical equation?

A balanced chemical equation is one in which the number of atoms of each element is equal on both the reactant and product sides, satisfying the law of conservation of mass.

What are the types of chemical reactions?

The main types of chemical reactions are: combination reactions, decomposition reactions, displacement reactions, double displacement reactions, and oxidation-reduction (redox) reactions.

What is the law of conservation of mass?

The law of conservation of mass states that mass can neither be created nor destroyed in a chemical reaction. The total mass of reactants equals the total mass of products.

What is a decomposition reaction?

A decomposition reaction is one in which a single compound breaks down into two or more simpler substances, usually when energy (heat, light, or electricity) is supplied.

What is a chemical reaction?

A chemical reaction is a process in which atoms of reactants are rearranged to form new substances called products. It involves breaking of bonds in reactants and formation of new bonds in products.

What is a balanced chemical equation?

A balanced chemical equation is one in which the number of atoms of each element is equal on both the reactant and product sides, satisfying the law of conservation of mass.

What are the types of chemical reactions?

The main types of chemical reactions are: combination reactions, decomposition reactions, displacement reactions, double displacement reactions, and oxidation-reduction (redox) reactions.

What is the law of conservation of mass?

The law of conservation of mass states that mass can neither be created nor destroyed in a chemical reaction. The total mass of reactants equals the total mass of products.

What is a decomposition reaction?

A decomposition reaction is one in which a single compound breaks down into two or more simpler substances, usually when energy (heat, light, or electricity) is supplied.

What is a chemical reaction?

A chemical reaction is a process in which atoms of reactants are rearranged to form new substances called products. It involves breaking of bonds in reactants and formation of new bonds in products.

What is a balanced chemical equation?

A balanced chemical equation is one in which the number of atoms of each element is equal on both the reactant and product sides, satisfying the law of conservation of mass.

What are the types of chemical reactions?

The main types of chemical reactions are: combination reactions, decomposition reactions, displacement reactions, double displacement reactions, and oxidation-reduction (redox) reactions.

What is the law of conservation of mass?

The law of conservation of mass states that mass can neither be created nor destroyed in a chemical reaction. The total mass of reactants equals the total mass of products.

What is a decomposition reaction?

A decomposition reaction is one in which a single compound breaks down into two or more simpler substances, usually when energy (heat, light, or electricity) is supplied.

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