Page 135 - Physics_Form_2

Nature and reflection of light

are glass panes of windows, glass slabs,
prisms, and clear plastics. Light

Light

Opaque
Transparent material
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material

Figure 4.5: Light falling on an opaque
material

Figure 4.3: Transmission of light through Task 4.3
transparent material
From your school and home
Translucent materials allow only part environment, collect and identify
of the light to pass through them but not transparent, translucent and opaque
enough to make a defined image. This materials. What is the importance of
happens as light rays get scattered when each material in your daily life?
passing through the material as shown
in Figure 4.4. Oiled paper and tinted Shadows
frosted glass are examples of translucent When an opaque object is in the path
materials. Tinted glass is used in car of a beam of light, a darkened region
windows. Some glass windows in houses is formed behind the object. Little or
are frosted to provide privacy. You cannot no light reaches this region because the
see clearly through a translucent material. opaque object does not allow light to pass

Light through it. This region is called a shadow.
The shadow is formed because light
travels in straight lines. Shadows have
Translucent
material sharp edges as shown in Figure 4.6.

Figure 4.4: Transmission of light through
translucent material

Opaque materials are materials which
totally block the light, as shown in Figure
4.5. A block of concrete, wood, a book, a
wall, and a human body are examples of
opaque materials. Figure 4.6: Tree shadow cast

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Physics Form 2 Final.indd 129 25/10/2025 10:27