The light الضوء
Light: it is external factors that affect the eyes causes Sensation of vision.مؤثر خارجى يؤثر على العين ويسبب الاحساس بالرؤية
*Al – Hassan Ibn Al haitham: is the first Arabic scientist who explain
The vision occurs due to falling of Light On object and reflects
To the eye causing the vision.
Source of light:
1-natural sources: as sun and stars مصادر طبيعية
2-Artificial sources:مصادر صناعية
as electric lamp – Kerosene lamp – candle – fire – torch.
The properties of lightخصائص الضوء
1-light travel in straight lineالضوء يسير فى خطوط مستقيمة
*the image inverted when light passes through narrow hole
*formation of shadow due to passing light in straight line
2-Light reflect: الضوء ينعكس light reflect when it falls on plane mirror.
3-light refract:الضوء ينكسر light refract when it pass from transparent Medium to another transparent medium.
4-Light analysis and form spectrum colour.الضوء يتحلل
* The light splits into seven colours called spectrum colour.
Which are: red – orange – yellow- green – blue –indigoنيلى –Violetالوان الطيف) بنفسجى )
*rain bow: it appears in the sky after rain fall due to analysis of light.
Light: it is external factors that affect the eyes causes Sensation of vision.مؤثر خارجى يؤثر على العين ويسبب الاحساس بالرؤية
*Al – Hassan Ibn Al haitham: is the first Arabic scientist who explain
The vision occurs due to falling of Light On object and reflects
To the eye causing the vision.
Source of light:
1-natural sources: as sun and stars مصادر طبيعية
2-Artificial sources:مصادر صناعية
as electric lamp – Kerosene lamp – candle – fire – torch.
The properties of lightخصائص الضوء
1-light travel in straight lineالضوء يسير فى خطوط مستقيمة
*the image inverted when light passes through narrow hole
*formation of shadow due to passing light in straight line
2-Light reflect: الضوء ينعكس light reflect when it falls on plane mirror.
3-light refract:الضوء ينكسر light refract when it pass from transparent Medium to another transparent medium.
4-Light analysis and form spectrum colour.الضوء يتحلل
* The light splits into seven colours called spectrum colour.
Which are: red – orange – yellow- green – blue –indigoنيلى –Violetالوان الطيف) بنفسجى )
*rain bow: it appears in the sky after rain fall due to analysis of light.