Light (Physics)
WEeb.in Team Science Total Views: 518 Posted: Jan 23, 2020 Updated: Oct 6, 2026
About LIGHT
- The speed of light in vacuum is 299,792,458 meters per second
- The medium through which light can pass easily is transparent medium
- The medium through which light can pass partially is translucent medium
- The medium through which light cannot pass is opaque medium
| Incident Ray | The ray of light which strikes the surface of a medium before reflecting back |
| Reflected Ray | The ray of light which strikes back from the medium after reflection is called reflected ray |
| Refracted Ray | The ray of light which that is transmitted into the second medium and travels in a different direction than the incident ray |
| Two Laws of Reflection | Angle of Incidence is equal to the angle of reflection
Incident Ray, Reflected Ray and the Normal drawn to the point of incidence all lie in the same plane |
| Diffused Reflection | When all parallel incident rays reflected from a plane surface are not parallel, it is diffused reflection |
Images are of two types :
| Real Image | Virtual Image |
- An image which can be obtained on a screen is called a real image.
- An image which cannot be obtained on a screen is called a real image.
- Mirror whose spherical surface is curved inwards is called a concave mirror
- Mirror whose spherical surface is curved outwards is called a concave mirror
- The center of curvature of a concave mirror is not a part of the mirror but lies in front of the mirror
- The center of curvature of a convex mirror is not a part of the mirror but lies behind the mirror
- Convex Lens is called a converging lens
- Concave Lens is called a divergent lens
- Total internal reflection is complete reflection of a ray of light within a medium such as water or glass from the surrounding surfaces back into the medium. The phenomenon occurs if the angle of incidence is greater than a certain limiting angle, called the critical angle.
- Phenomenon of splitting of a beam of white light into its constituent colors on passing through prism is called Dispersion of Light
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