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✅ Concave Mirrors: By reflection of light, concave mirrors give real, inverted images if the object is beyond the focus and a virtual, erect, enlarged image if the object has a distance less than the focal length from the pole of the mirror. 👉🏻 Uses of Concave Mirrors: ➖ Concave mirrors are used in torches, searchlights, and headlights of vehicles to get powerful parallel beams of light. ➖ Concave mirrors are also used as shaving mirrors to see a larger image of the face. ➖ Dentists use concave mirrors to see bigger images of the teeth of the patients. ➖ Large concave mirrors are used to focus sunlight to produce heat in the solar furnaces. ✅ Convex Mirrors: By the reflection of light convex Mirrors always give a virtual, erect, diminished image of the object kept infront of the mirror. 👉🏻 Uses of Convex Mirrors: ➖ The convex mirror is used as a side-view mirror in vehicles to give a smaller view of the vehicles coming from behind. ➖ They are used in shops and supermarkets and any other place where there is a requirement for detecting burglars. ➖ Convex mirrors are used in making lenses for sunglasses. ➖ Convex mirrors are used in magnifying glasses, and telescopes. ➖ Convex mirrors are used to reflect street light; because they can reflect over a wide area. ➖ Convex mirrors are kept at the street corners to avoid collisions.

🔰 Mechanical Properties of Solids 🔰 Mechanical properties of solids describe the response of materials to external loads and the behavior of materials under stress and strain. Some of the key mechanical properties of solids include: ➖ Elasticity: Elasticity refers to the ability of a solid to return to its original shape after the removal of an external load. Young's modulus is a measure of the elasticity of a material and describes the ratio of stress to strain within the elastic limit of a material. ➖ Plasticity: Plasticity refers to the permanent deformation of a material under stress. The yield strength is the stress required to cause a material to undergo plastic deformation, while ductility is a measure of a material's ability to deform plastically without breaking. ➖ Toughness: Toughness is a measure of a material's ability to absorb energy before breaking. It is a combination of strength and ductility and is an important property for materials used in applications where impact resistance is required. ➖ Hardness: Hardness is a measure of a material's resistance to deformation, scratching, and abrasion. It is often measured using hardness tests such as the Rockwell test or the Vickers test. ➖ Fatigue: Fatigue is the progressive and localized failure of a material caused by repeated or fluctuating stress. Fatigue failure occurs in materials subjected to cyclic loads and is a common cause of failure in engineering structures such as bridges and aircraft components.

♻️ Important Scientific Laws and Theories ♻️ ============================== 🔹 Ohm's Law - It states that the current passing through a conductor between two points is directly proportional to the potential difference across the two points provided the physical state and temperature etc. of the conductor does not change. 🔹 Pauli exclusion principle - It explains that no two electrons in the same atom or molecule can have the same set of quantum numbers. 🔹 Raman effect - It is the change in wavelength that occurs when light is scattered by the atoms or molecules in a transparent medium. 🔹 Tyndall effect - The scattering of light by very small particles suspended in a gas or liquid. 🔹 Boyles's Law - It states that temperature remaining constant, volume of a given mass of a gas varies inversely with the pressure of the gas. Thus, PV = K (constant), where, P = Pressure and V = Volume. 🔹 Charles's Law - It states that pressure remaining constant, the volume of a given mass of gas increases or decreases by 1/273 part of its volume at 0 degree celsius for each degree celsius rise or fall of its temperature. 🔹 Coulomb's Law - It states that force of attraction or repulsion between two charges is proportional to the amount of charge on both charges and inversely proportional to the square of the distance between them. 🔹 Heisenberg principle (uncertainty principle) - It is impossible to determine with accuracy both the position and the momentum of a particle such as electron simultaneously. 🔹 Archimede's principle - It states that a body when wholly or partially immersed in a liquid, experiences an upward thrust which is equal to the weight of the liquid displaced by it. Thus, the body appears to lose a part of its weight. This loss in weight is equal to the weight of the liquid displaced by the body. 🔹 Aufbau principle - It states that in an unexcited atom, electrons reside in the lowest energy orbitals available to them. 🔹 Avogadro's Law - It states that equal volumes of all gases under similar conditions of temperature and pressure contain equal number of molecules. 🔹 Brownian motion - It is a zigzag, irregular motion exhibited by small solid particles when suspended in a liquid or gas due to irregular bombardment by the liquid or gas molecules. 🔹 Bernoulli's principle - It states that as the speed of a moving fluid, liquid or gas, increases, the pressure within the fluid decreases. The aerodynamic lift on the wing of an aeroplane is also explained in part by this principle. 🔹 Gay-Lussac’s Law of combining volumes - Gases react together in volumes which bear simple whole number ratios to one another and also to the volumes of the products, if gaseous — all the volumes being measured under similar conditions of temperature and pressure. 🔹 Graham’s Law of Diffusion - It states that the rates of diffusion of gases are inversely proportional to the square roots of their densities under similar conditions of temperature and pressure. 🔹 Kepler's Law - Each planet revolves round the Sun in an elliptical orbit with the Sun at one focus. The straight line joining the Sun and the planet sweeps out equal areas in equal intervals. The squares of the orbital periods of planets are proportional to the cubes of their mean distance from the Sun. 🔹 Law of Floatation - For a body to float, the following conditions must be fulfilled: The weight of the body should be equal to the weight of the water displaced and the centre of gravity of the body and that of the liquid displaced should be in the same straight line. 🔹 Law of conservation of energy - It states that energy can neither be created nor destroyed but it can be transformed from one form to another. Since energy cannot be created or destroyed, the amount of energy present in the universe is always remain constant. 🔹 Newton's First Law of Motion - An object at rest tends to stay at rest, and an object in motion tends to stay in motion, with the same direction and speed in a straight line unless acted upon by some external force.

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NOW FOR YOU TO UNDERSTAND HOW TO CALCULATE THE RADIOACTIVE CHANGES IN NUCLEAR CHEMISTRY YOU MOST AND HAVE TO GO BACK TO YOUR PHYSICS TEXTBOOK CALLED 👉ALL INCLUSIVE CALCULATIONS IN PHYSICS 👈 , STARTING FROM PAGE 424 READ DOWN TO PAGE 447.

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