Explanation

Convex lenses are also known as converging lenses since the rays converge after falling on the convex lens.

The concave lens are known as diverging lenses, as the rays diverge after falling on the concave lens.

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RY24012023

Explanation

When light shines on a photovoltaic (PV) cell – also called a solar cell – that light may be reflected, absorbed, or pass right through the cell.

The PV cell is composed of semiconductor material; the “semi” means that it can conduct electricity better than an insulator but not as well as a good conductor like a metal.

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RY24012023

Explanation

The breakdown of CFCs releases chlorine, which then acts as a catalyst for the destruction of the ozone layer.

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ND22-1-2023

Explanation

• A pollutant is a substance or energy that causes pollution.
• It is an undesirable change to the environment.

Explanation

Vitamin A deficiency can cause a range of health problems, including:

• Night blindness (difficulty seeing in low light)
• Xerophthalmia (dry eyes)
• Keratomalacia (softening of the cornea)
• Immune system weakness
• Increased risk of infections

Explanation

• Water has its minimum density at 0°C.
• Water has its maximum density at 4°C.

Explanation

The form of cell division known as mitosis is responsible for the body's expansion and repair.

while

Gametes are created as a result of the cell division process known as meiosis.

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ND22-1-2023

Explanation

Thermochemistry is the study of chemical reactions and the energy changes that involve heat.

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RY24012023

Explanation

Telescope: It is a device used to see distant objects.

The word telescope was coined in 1611 by the Greek mathematician Giovanni Demisiani 

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ND22-1-2023

Explanation

• The pupil is the opening in the center of the iris that regulates the amount of light entering the eye, similar to the aperture in a camera.
• The iris controls the size of the pupil, adjusting the amount of light that reaches the retina.