Lens and Mirror Equation: Powerful Formula, Examples & Facts 2026
The lens and mirror equation 1/f = 1/u + 1/v explained: sign conventions, magnification, real vs virtual images, and worked examples for lenses and curved mirrors.
The lens and mirror equation 1/f = 1/u + 1/v explained: sign conventions, magnification, real vs virtual images, and worked examples for lenses and curved mirrors.
Why doesn’t a book simply fall through a table when gravity pulls it downward? The answer is the normal force. This contact force acts between surfaces and can support an object against gravity or other forces. The normal force is a contact force that acts perpendicular, or normal, to the surface touching an object. In…
Stress σ = F/A (Pa), strain ε = ΔL/L₀ (dimensionless), Young’s modulus E = σ/ε (Pa). Elastic and plastic deformation, stress-strain graph, and 4 worked examples.
Magnetic flux Φ = BAcosθ and Faraday’s law EMF = −NdΦ/dt. Lenz’s law sign explained, electromagnetic induction, flux linkage, generators, and 4 worked examples.
Why does a car stay on a curved road instead of continuing straight? Why does a ball tied to a string move in a circle instead of flying away? The answer is centripetal force. It is the inward-directed force that continually changes an object’s direction and keeps it moving along a circular path. Centripetal force…
Why is it easier to open a door by pushing near the handle than by pushing close to the hinges? The force may be the same, but the distance from the pivot changes the turning effect. This turning effect is known as torque. Torque is one of the most important concepts in rotational motion. It…
Have you ever wondered why a metal spoon becomes hot in a cup of tea, why warm air rises, or how heat from the Sun reaches Earth through empty space? These everyday examples are all connected to heat transfer. Heat can move from one place to another in several ways. The three main types are…
Why does a metal spoon become hot quickly when placed in hot water, while a large amount of water can absorb plenty of heat without its temperature changing as quickly? The answer is related to a physical property called specific heat capacity. Specific heat capacity tells us how much thermal energy is needed to raise…
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