Answer: A mirror is defined as a reflecting surface and can be explained by the law of reflection, which states that when a ray of light is made... View Article
The sky appears dark instead of blue to an astronaut, as a scattering of light does not take place outside the earth’s atmosphere. There is no... View Article
The ability of the lens of the eye to adjust its focal length to clearly focus rays coming from distant as well from near objects on the retina... View Article
(c) 25 cm 25 cm is the least distance of distinct vision for a young adult with normal vision. The range of vision of a normal human eye is... View Article
(d) retina The retina is the layer of nerve cells lining the back wall inside the eye. This layer senses light and sends signals to the brain... View Article
(a) Presbyopia A difficulty to see both nearby and far objects is called Presbyopia. Presbyopia is caused as part of the natural ageing... View Article
The student is suffering from short-sightedness or myopia. Myopia can be corrected by the use of a concave or diverging lens of appropriate... View Article
Near Point The minimum distance of the object from the eye, which can be seen distinctly without strain is called the near point of the eye.... View Article
Our environment comprises a wide variety of natural resources. Nowadays due to over utilisation we have exploited these natural resources. We... View Article
As an individual one should make the contribution and some variations for the management of Forests and wildlife, water resources and coal... View Article
Our resources like forests, wildlife, water, coal and petroleum need to be used sustainably. We can reduce pressure on the environment by... View Article
Rainwater harvesting is the simple process or technology used to conserve Rainwater by collecting, storing, conveying and purifying of Rainwater... View Article
Forests are the major part of an ecosystem. They are an abode to various plants and animals. They maintain environmental balance by inhaling... View Article
Biomass Biomass is the fuel developed from organic matter waste of living organisms like plant waste, animal waste, forest waste, and municipal... View Article
Fossil fuel and solar energy are rich energy sources. Both types of fuel have positive and negative effects. Fossil fuels are the fuels... View Article
Renewable energy is energy that is produced from natural processes and continuously replenished. Few examples of renewable energy are sunlight,... View Article
Hydrogen gas is cleaner than Compressed Natural Gas (CNG). This is because CNG contains hydrocarbons. Carbon acts as a form of pollutant in CNG.... View Article