Light
Download as PPTX, PDF
0 likes376 views
Light travels in a straight line at 300,000 m/s. When light hits a surface, it can be reflected, absorbed, or pass through. Reflection occurs when light bounces off a surface and can be diffuse or clear. Diffuse reflection scatters the light in all directions from a rough surface, while clear reflection forms an image from a smooth surface.
Light
- 2. Always travels in a straight line. This is the rectilinear propagation of light Speed = 300,000 m/s Travels in the form of wavelength
- 3. When light hits any surface it may 1. Bounce back 2. Absorb 3. Pass through
- 4. When light hits any surface and bounces back ,it is called reflection . There may be two types of reflection : Diffuse reflection Clear reflection
- 5. From a rough surface The rays may go in any direction Image generally not formed The surface will not act as a mirror
- 6. From smooth and shiny surface An image is formed The surface will act as a mirror
- 7. Real : An image which forms on a screen Virtual : An image which is formed inside the mirror Erect :straight Inverted : an image which is not straight Lateral inversion : when left side appears on right and right appears on left side
- 8. N粥意雨檎掘 OF THE IMAGE : Laterally inverted Erect Same size Distance between object and the mirror is same as the distance between the image and the mirror Virtual surface normal same exit ray incident ray angle reflected ray
- 9. Angle of incidence = Angle of reflection Normal , incident ray and the reflected ray , they all lie on the same plane.
- 10. Real Focus Parallel rays Focal length = + Forms real, inverted, Reduced or enlarged Reflected rays Image. Also forms Virtual, erect, Enlarged images.
- 11. OBJECT IMAGE NATURE BETWEEN P AND BEHIND THE ERECT,VIRTUAL,ENLARGED F MIRROR AT F NO IMAGE - BETWEEN C BEYOND C INVERTED,REAL,LARGE AND F AT C AT C INVERTED,SAME SIZE ,REAL BEYOND C BETWEEN C AND INVERTED, REAL,SMALL F
- 12. Virtual focus Parallel rays Focal length = - Reflected rays Forms only virtual, erect, reduced images between the virtual focus and the mirror.
- 13. OBJECT IMAGE NATURE BETWEEN P AND F BETWEEN P AND VIRTUAL,ERECT,SMALL F(INSIDE THE MIRROR) AT F BETWEEN P AND VIRTUAL,ERECT,SMALL F(INSIDE THE MIRROR) BETWEEN C AND F BETWEEN P AND VIRTUAL,ERECT,SMALL F(INSIDE THE MIRROR) AT C BETWEEN P AND VIRTUAL,ERECT,SMALL F(INSIDE THE MIRROR) BEYOND C BETWEEN P AND VIRTUAL,ERECT,SMALL F(INSIDE THE MIRROR)
- 14. A ray thru the Center of the lenses Parallel ray Passes thru The focus 2f focus (f) focus (f) 2f x x x x Remains unbent Refracts parallel To principal axis
- 15. OBJECT IMAGE NATURE BETWEEN P AND BEHIND THE ERECT,VIRTUAL,ENLARGED F MIRROR AT F NO IMAGE - BETWEEN C BEYOND C INVERTED,REAL,LARGE AND F AT C AT C INVERTED,SAME SIZE ,REAL BEYOND C BETWEEN C AND INVERTED, REAL,SMALL F
- 16. Parallel ray 2f f f 2f Image is: Virtual Erect Reduced Appears on same Side as object
- 17. OBJECT IMAGE NATURE BETWEEN P AND F BETWEEN P AND VIRTUAL,ERECT,SMALL F(INSIDE THE MIRROR) AT F BETWEEN P AND VIRTUAL,ERECT,SMALL F(INSIDE THE MIRROR) BETWEEN C AND F BETWEEN P AND VIRTUAL,ERECT,SMALL F(INSIDE THE MIRROR) AT C BETWEEN P AND VIRTUAL,ERECT,SMALL F(INSIDE THE MIRROR) BEYOND C BETWEEN P AND VIRTUAL,ERECT,SMALL F(INSIDE THE MIRROR)