Veins are blood vessels that carry deoxygenated blood back to the heart. They have thinner walls than arteries and often contain valves to prevent blood from flowing backward.
Category: Class 10 Science
NCERT Solutions for Class 10 Science and important questions for CBSE class 10 for session 2020-2021
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Lenses refract light, converging (convex) or diverging (concave) based on shape. They produce real or virtual images, affecting magnification and focus. Commonly used in cameras, eyeglasses, and microscopes.
A concave mirror curves inward and reflects light. It converges parallel rays to a focal point, enabling real or virtual image formation. Used in applications like makeup mirrors and telescopes.
Spherical lenses and mirrors have curved surfaces. Lenses can be converging (convex) or diverging (concave), affecting light focus. Mirrors, concave or convex, influence reflection properties, used in optics for various applications.
Sodium is a highly reactive alkali metal with atomic number 11. It’s silver-white, soft, and abundant in nature. It reacts vigorously with water, producing sodium hydroxide and hydrogen gas.