Explanation

A camera uses a convex lens to focus light and form a clear image on the sensor or film.

The convex lens converges light rays to produce a sharp image.

Explanation

Skimmed milk is processed to remove most of the fat content.

This making it the lowest in fat compared to full cream, dried, or powdered milk.

Explanation

Decibels measure sound intensity (amplitude)

Sound is energy that travels in waves.

It can be measured in two ways: frequency and amplitude.

Explanation

When water vapour in the air condenses and accumulates around a dust particle near the ground, fog is formed.

Cloud of small water droplets near ground level that is dense enough to reduce horizontal visibility to less than about 3,000 ft (1,000 m).

Fog may also refer to clouds of smoke particles (smog), ice particles, or mixtures of these components.

Explanation

Smallpox was eradicated in Pakistan in 1980, along with the rest of the world, as declared by the World Health Organization (WHO).

Explanation

• Muscular degeneration, also known as Age-related Macular Degeneration (AMD).
• It is a disease that affects the macula, the part of the retina responsible for central vision.
• It causes vision loss in the central field of vision, making everyday tasks like reading, driving, and recognizing faces challenging.

Explanation

The depletion of the Earth's ozone layer allows more harmful ultraviolet (UV) radiation from the sun to reach the Earth's surface, leading to:

• Increased risk of skin cancer and cataracts in humans
• Damage to crops and marine life
• Disruption of ecosystems

Explanation

Glaucoma is caused by an increase in pressure within the eyeball, specifically in the fluid pressure inside the eye.

This increased pressure can damage the optic nerve and lead to vision loss if left untreated.

Explanation

• Erosion is the process of wearing away or removal of topsoil, rock, or other materials from the Earth's surface by natural forces such as wind, water, or ice.
• It is a natural process that shapes the landscape and can lead to the loss of fertile soil, landslides, and other geological changes.

Explanation

Indigo is a large genus (Indigofera) of plants in the family Fabaceae, which includes trees, shrubs, and herbs.