Explain Sign Convention
All distances are to be measured starting from the optical centre of the lens. All real distances are positive and real distances means the distance…
Physics
What is Power of Lens
Suppose there are two convex lenses. The focal length of the fast one is greater and the focal length of the second one is smaller.…
Explain Image of an Extended object Concave Lens
Suppose LOL1 is a concave lens. FOF’ is its principal axis, O is its optical center and F is its principal focus. An extended object…
Explain Image of Extended object of Convex Lens
Suppose LOL1 is a convex lens. FOF′ is its principal axis, O is its optical center and F is its principal focus. An extended object…
Rules of Drawing Ray Diagram in Lens
Rules of Drawing Ray Diagram in Lens Rays of the light incident in a direction through the optical center of a lens are refracted along…
Explain Principal Focus
Principal Focus: When a pencil of parallel rays adjacent to the principal axis incident on a lens in a direction parallel to principal axis, then…
Few Definitions Related to Lens
Centre of curvature: Both surfaces of a lens are parts of different spheres. The centre of each sphere is called the centre of curvature of…
Lens and their Classification
A lens is a transparent refractive medium bounded by two spherical surfaces. Lenses are of two types: i) Convex lens or converging lens ii) Concave…
What is Optical Fiber?
The optical fiber is made of very long thin flexible but solid glass or plastic fiber. The refractive index of the material of fiber is…
What is Mirage?
Sometimes thirsty traveler in desert sees the inverted image of a distant tree and thinks there is water. When he comes close to the tree…
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