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.
Human heart, a muscular organ, pumps blood throughout the body, delivering oxygen and nutrients. With four chambers and a rhythmic beat, it plays a vital role in maintaining circulation and sustaining life.
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.