Class 10 Science (physics) Chapter 10 Light : Reflection and Refraction

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 ~ Image Formation by concave        mirror 

Figure 10.7 illustrates the ray diagrams

for the formation of image by a concave

mirror for various positions of the object.













Fig.10.7 Ray diagrams for the image formation by a concave mirror. 


~ Uses of concave
mirrors
Concave mirrors are commonly used in

 torches, search-light and vehicles

 headlights to get powerful parallel

 beams of light. They are often used

 as shaving mirrors to see a larger

 image of the face. The dentists use

concave mirrors to see large Images
of the teeth of patients. Large

concave mirrors are used to
 concentrate

sunlight to produce heat in Solar

 furnaces. 

b) Image formation by a convex mirror 

We studied the Image formation by a concave

 mirror. Now we shall study the formation of

 image by a convex mirror. 

We consider two positions of the image

 formed by a convex mirror. The ray diagrams

 for the formation of image by

 a convex mirror for these

two positions of the object shown in fig.10.8(a)

 and (b), respectively. 






~ Uses of convex mirrors 

Convex mirrors are commonly used as

 rear-view (wing) mirrors in vehicles.

 These mirrors are fitted on the sides of

 thevehicle, enabling the driver to see

 traffic behind him/her to facilitate safe

 driving.

 Convex mirrors are preferred because

 they always give an erect, though

 diminished, image. Thus, convex

 mirrors enable the driver to view much

 larger area than would be possible with

 a plane mirror. 



~ Mirror Formula and Magnification 

In a spherical mirror, the

 distance of the object

 from its pole is called the

 object distance (u).

 Thedistance of the image

 from the pole of the mirror is

 called the image distance (v). 

 You already know that the

 distance of the principal

 focus from the pole is

 called the focal length (f).

These three quantities

 given by the mirror

 formula which is

 expressed as 

                            MIRROR FORMULA 

This formula Is valid in all situations

 for all spherical mirrors for all

 positions of the object. You must use

 the New Cartesian sign convention

 while substituting numerical values

 for u,v,f, and R in the mirror formula

 for solving problems. 


MAGNIFICATION...

   To be Continued.....


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