Explain Principal Focus
Physics

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
Physics

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
Physics

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?
Physics

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?
Physics

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…
What is Total Internal Reflection
Physics

What is Total Internal Reflection

If the angle of incidence in denser medium is increased further (i > θc), then the incident ray of light will be totally reflected in…
What is Critical Angle
Physics

What is Critical Angle

When ray of light passes from a denser medium to a rarer medium, then the refracted my is deviated away from the normal. As a…
Explain Refractive Index
Physics

Explain Refractive Index

For a particular pair of transparent medium and a. particular colour of light when ray of light refracts from one medium to another, then if…
Describe Laws of Refraction of Light
Physics

Describe Laws of Refraction of Light

We have already noticed that in the figure AB is the incident ray, BC is the refracted ray and NBN’ is the normal drawn at…
Explain Refraction of Light
Physics

Explain Refraction of Light

Look at figure 1, here two media, air and glass are shown. Coming from air medium following the path AB, light ray incidents at point…
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