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Nature and reflection of light
FOR ONLINE READING ONLY
Figure 4.39: A shaving mirror
Reflecting telescopes: A concave mirror (primary mirror) forms images of distant stars
at the focal point. A plane mirror (secondary mirror) is then used to project the rays to
the side where the image can be viewed through a lens, as shown in Figure 4.40.
Eyepiece
Telescope
tube Primary mirror
Light
from
distant
object
Secondary mirror
Figure 4.40: Reflecting telescope
In some cases, the concept of
light reflection off concave
surfaces is used for applications
beyond light and image
formation, outlined as follows:
Satellite dishes: Satellite
dishes are specialized antennas
designed to receive and transmit
signals to and from satellites
in orbit. Figure 4.41 shows a
satellite dish. Figure 4.41: A satellite dish
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Physics Form 2 Final.indd 159 25/10/2025 10:27
