Physics assignment for grade 8

1. An object that has 4 cm of height is located 15 cm in front of the concave mirror.
   If the focal length  of the concave mirror is 10 cm, determine :
   a.The distance of image!
   b.Magnification of image!
   c.Height of image!
   d.The characteristics of image!
2. An object that has 5 cm of height is located 60 cm in front of the convex
    mirror. If the focal length of the convex mirror is 15 cm, determine :
   a.The distance of image!
  b.Magnification of image!
  c.Height of image!
  d.The characteristics of image!

Convex Mirror

Defining of convex
The convex mirror is the outside of the spherical surface is the reflecting surface.
The characteristic of concave mirror to spread of rays or DIVERGEN
The cut point of focusing reflected rays mentioned FOCUS LENGTH
Special rays of convex Mirror
1. A ray parallel to the mirror axis of a concave mirror seems to come from the
focal point of a convex mirror

 

2. A ray that passes through the focal point of a concave mirror is reflected parallel

    to the mirror axis 

3. A ray that proceeds along a radius of the mirror is reflected back original path

nShaping its  image if an object is placed in front of the convex mirror

 The nature of image is virtual, erect and diminished

The mirror equations can be applied to either concave or convex mirrors

                 1/s + 1/s^’   =   1/f   or   1/s + 1/s^’   =   2/R

                  Because f = ½ R

                

                   Where:    s   = the distance of object

                                   s^’   =  the distance of  image

                                    f    = the distance of the focal point

                                    R   = radius of curvature