A concave lens is a transparent optical device with curved surfaces that diverges light rays. It causes parallel light rays to spread out and is commonly used in correcting nearsightedness in eyeglasses.
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A convex lens is a transparent optical device with curved surfaces that converges light rays, causing them to meet at a focal point. It is used in magnifying glasses, cameras, and eyeglasses.
The human heart is a vital organ that pumps blood through the circulatory system. It consists of four chambers—two atria and two ventricles. Its rhythmic contractions maintain blood circulation and oxygenate tissues.
The human brain is a complex organ responsible for cognition, emotions, and control of bodily functions. It consists of billions of neurons interconnected through synapses, forming the basis of consciousness and intelligence.
Ozone layer depletion is the thinning of the ozone layer in Earth’s stratosphere, primarily caused by human-made substances like chlorofluorocarbons (CFCs). This leads to increased UV radiation, harming ecosystems and health.