Page 153 - Physics_Form_2
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Nature and reflection of light
that the angle of incidence equals the angle of 3. Use the scale to draw an
reflection.
upright arrow at a point
4. Any incident ray travelling toward a convex far from the mirror. The
mirror such that its extension passes through arrow represents an object
the centre of curvature will be reflected along at a position far from the
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its path. mirror.
4. Draw a ray from the tip
Note: The image of an object can be located by point of the arrow towards
drawing any two of the stated rays. the focal point, which is
on the opposite side of
A 1 the mirror. This ray will
4 strike the mirror before
3 2 A'
reaching the focal point;
Object F B stop the ray at the point of
B' incidence with the mirror.
Image
5. Draw the second ray such
that it travels exactly
parallel to the principal
Figure 4.27: Image formed by a convex mirror axis. Remember to place
arrowheads upon the rays
Activity 4.9 Aids in understanding characteristics to indicate their direction.
of image formed by convex mirrors. 6. Once the incident rays
strike the mirror, they
Activity 4.9 are reflected according
to the rules of reflection
Aim: To determine the images formed by for convex mirrors. For
a convex mirror example, the ray that
Materials: graph paper, a sharp pencil, a ruler travels towards the focal
Procedure point will be reflected
and travel parallel to
1. Choose an appropriate scale so that the ray the principal axis. The
diagram fits on the available space, and draw a incident ray that travels
convex mirror at the centre of the graph paper. parallel to the principal
2. Draw a horizontal line passing through the axis is reflected and
centre of the convex mirror. This is the travels in a direction
principal axis. Locate the centre of curvature, such that the reflected
C and the focal point, F on the principal axis ray, extended backwards,
such that there is a considerable distance passes through the focal
between C and P. point.
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Physics Form 2 Final.indd 147 25/10/2025 10:27
