LIGHT AND SIGHT
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Light can be reflected, refracted, and dispersed. Reflection follows the law that the incident angle equals the reflected angle, forming virtual upright images of the same size. Refraction occurs when light changes speed passing between media of different densities. Defects of vision include short-sightedness where distant objects are blurry and long-sightedness where near objects are blurry. Both can be corrected with lenses. Limitations of sight are that we cannot see through opaque objects, tiny objects, or distant objects. Optical illusions form accurate images that are misinterpreted and we have a blind spot where the eye cannot detect images.
LIGHT AND SIGHT
- 1. LIGHT AND SIGHT BY: EN. KAMARUZAMAN BIN ABD SAMAD
- 2. Can be reflect Travel in straight line PROPERTIES OF LIGHT Can be disperse Can be refract
- 3. 2- i (incident angle) = r (reflected angle) 1- Light bounce the surface of object REFLECTION 3- Properties image on plane mirror upright virtual Same size
- 4. i r
- 6. REFRACTION speed of light change when pass from one medium to another medium in different density
- 7. 90 o line (normal) AIR WATER
- 8. 90 o line (normal) AIR WATER
- 9. AIR WATER
- 10. AIR WATER
- 11. DEFECT OF VISION & LIMITATION OF SIGHT
- 12. Learning Objective At the end of the lesson the students must able: 1- Describe the defect of vision 2- State the limitation of sight.
- 13. DEFECT OF VISION SHORT-SIGHTEDNESS (MYOPIA) LONG-SIGHTEDNESS (HYPERMETROPIA) Distant object Near object Close object clear Distant object blur Sharp image form in front of retina Caused: Eyeball Eye-lens Close object blur Distant object clear Sharp image form behind the retina Caused: too long too thick Overcome: concave lens Eyeball Eye-lens too short too thin Overcome: convex lens
- 15. Continue DEFECT OF VISION Colour blindness Astigmatism - Genetic disease. -Caused by irregular surface of - Lack photoreceptor on retina. cornea. - Cant determine red and green. - Sees some part of object more clearly than other part. - Correction: -Surgery -Special lens
- 16. We cant see through opaque object We cant see tiny object We cant see distant object LIMITATION OF SIGHT OPTICAL ILLUSION BLIND SPOT Image form in accurate but misinterpreted by brain Eye cannot detect image that fall on the spot
- 17. Do You See the Bunny or the Duck?
- 18. What do you see at first an old lady or a young woman?