Ray Optics And Optical Instruments Class 12 Ppt To Pdf
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- Ray Optics - PowerPoint Presentation, Science, Class XII, CBSE Class 11 Notes | EduRev
Ray Optics and Optical Instruments Class 12 Notes have been subdivided into the following sub-sections to help students navigate through them easily:. In this section from notes of the chapter Ray Optics Class 12, the rectilinear propagation of light theory has been explained thoroughly with the help of a diagram of a ray of light.
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Mani, Principal, K V No. At a particular value of angle of incidence the angle of deviation becomes minimum and is called angle of minimum deviation. Refraction by a Small-angled Prism for Small angle of Incidence:andIf i is assumed to be small, then r1, r2 and e will also be very small. Dispersion of White Light through Prism:The phenomenon of splitting a ray of white light into its constituent colours wavelengths is called dispersion and the band of colours from violet to red is called spectrum VIBGYOR.
Dispersion can also be explained on the basis of Cauchys equation. So, the colours get separated with different angles of deviation. Violet is most deviated and Red is least deviated. Angular Dispersion:The difference in the deviations suffered by two colours in passing through a prism gives the angular dispersion for those colours. The angle between the emergent rays of any two colours is called angular dispersion between those colours.
It is the rate of change of angle of deviation with wavelength. Dispersive Power:The dispersive power of the material of a prism for any two colours is defined as the ratio of the angular dispersion for those two colours to the mean deviation produced by the prism. It may also be defined as dispersion per unit deviation. The amount of scattering is inversely proportional to the fourth power of the wavelength. Rayleigh Effect Light from the Sun near the horizon passes through a greater distance in the Earths atmosphere than does the light received when the Sun is overhead.
The correspondingly greater scattering of short wavelengths accounts for the reddish appearance of the Sun at rising and at setting.
When looking at the sky in a direction away from the Sun, we receive scattered sunlight in which short wavelengths predominate giving the sky its characteristic bluish colour.
Eyepiece: The converging lens through which the final image is seen. Both are of short focal length. Focal length of eyepiece is slightly greater than that of the objective. Angular Magnification or Magnifying Power M :Angular magnification or magnifying power of a compound microscope is defined as the ratio of the angle subtended by the final image at the eye to the angle subtended by the object seen directly, when both are placed at the least distance of distinct vision.
Aperture of the objective is also large to allow more light to pass through it. Angular magnification or Magnifying power of a telescope in normal adjustment is the ratio of the angle subtended by the image at the eye as seen through the telescope to the angle subtended by the object as seen directly, when both the object and the image are at infinity.
Angular magnification or magnifying power of a telescope in this case is defined as the ratio of the angle subtended at the eye by the final image formed at the least distance of distinct vision to the angle subtended at the eye by the object lying at infinity when seen directly.
Also, it is to be noted that in this case M is larger than that in normal adjustment position. Resolving Power of a Microscope:The resolving power of a microscope is defined as the reciprocal of the distance between two objects which can be just resolved when seen through the microscope. Resolving power depends on i wavelength , ii refractive index of the medium between the object and the objective and iii half angle of the cone of light from one of the objects. Resolving Power of a Telescope:The resolving power of a telescope is defined as the reciprocal of the smallest angular separation between two distant objects whose images are seen separately.
Resolving power depends on i wavelength , ii diameter of the objective a. Log in Get Started. Download for free Report this document. Embed Size px x x x x ADLvouoPoPe Angular Magnification or Magnifying Power M :Angular magnification or magnifying power of a compound microscope is defined as the ratio of the angle subtended by the final image at the eye to the angle subtended by the object seen directly, when both are placed at the least distance of distinct vision.
IABObjectiveAstronomical Telescope: Image formed at LDDV PoFoEyePefoFefeEyepieceueD Angular magnification or magnifying power of a telescope in this case is defined as the ratio of the angle subtended at the eye by the final image formed at the least distance of distinct vision to the angle subtended at the eye by the object lying at infinity when seen directly. Newtonian Telescope: Reflecting Type Concave MirrorPlane MirrorEyepieceEyeLight from starMagnifying Power: Resolving Power of a Microscope:The resolving power of a microscope is defined as the reciprocal of the distance between two objects which can be just resolved when seen through the microscope.
Optics is the branch of physics that studies the behaviour and properties of light , including its interactions with matter and the construction of instruments that use or detect it. Because light is an electromagnetic wave , other forms of electromagnetic radiation such as X-rays , microwaves , and radio waves exhibit similar properties. Most optical phenomena can be accounted for by using the classical electromagnetic description of light. Complete electromagnetic descriptions of light are, however, often difficult to apply in practice. Practical optics is usually done using simplified models. The most common of these, geometric optics , treats light as a collection of rays that travel in straight lines and bend when they pass through or reflect from surfaces.
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RAY OPTICS - II 1. Refraction through a Prism 2. Expression for Refractive Index of Prism 3. Dispersion 4. Angular Dispersion and Dispersive.
Ray Optics - PowerPoint Presentation, Science, Class XII, CBSE Class 11 Notes | EduRev
It is possible to see images when converging image light rays reflect off of mirrors. When light is reflected off a mirror, it hits the mirror at the same angle i, the reflected incident ray incidence angle as it ray reflects off the mirror r, the reflection angle. Mirror J.
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