LIGHT SHUBHENDRA.pptx for bed students help

helpful

1. , B. Ed., 2 ND YEAR SESSION- (2020-2022) TOPIC- LIGHT PREPARED BY :

2. LIGHT Light is a form of energy . Light is needed to see the object around us.

3. CHARACTERSTIC OF LIGHT Light is a form of energy produced by luminous object. Light can travel through vaccum . Light can penetrate through transparent material but can not pass through opaque object. Light travel in a straight line .

4. Luminous object:- The object which emit own light are called luminous object. EXAMPLE - Sun ,Star ,Candle etc . NON-LUMINOUS OBJECT:- Those object which themselves but only reflect the light which falls on them are called non-luminous object . EXAMPLE- Chair, Fan, Pen, Book etc .

5. REFLECTION OF LIGHT The process which sending back the light rays which fall down the surface of an object is called reflection of light . Normal A B Incident i r Refrection ray ray O

6. Law of referection of light: There are two law of refelection :- First law of reflection- The incident ray ,the reflected ray and the normal all lie in a same plane . Second law of reflection- The angle of reflection is alwaysbequal to the angle of incident .

7. When the object is placed at the focus of a concave mirror(object at F) E D P ’ A B F C Image at Infinity Object Concave mirror

8. When the object is placed between focus and centre of curvature(Object between F and C) E D P ’ A B F C Object B’’ A’’ Concave mirror

9. When the object placed at the centre of curvature of a mirror (object at C) B C B’’ ’ F D P E Concave mirror A A’’ OBJECT IMAGE

10. When the object is beyond the centre of curvature of the concave mirror(object beyond C) B ’ D P E Concave mirror A F C OBJECT IMAGE B’’ A’’

11. THANK YOU