for classroom discussion Grade 10 Science-Second Quarter

1. Visible Light
Properties and
Uses

2. • All waves in the electromagnetic spectrum are
light waves
• Visible light – part of the spectrum that
humans CAN see

3. • Human eyes detect the brightness, or
intensity, of visible light, which is
determined by the amplitude of a light
wave
• Human eyes are sensitive to EM wave
that range from 380 nanometers to
about 740 nanometers and a frequency
of 430-770 THz, that’s why its called the
Visible spectrum

4. • human eyes do not detect wavelengths
outside of this range
• The visible light range further divides into
smaller regions depending on wavelength;
humans recognize these smaller regions as
colors.
• Visible light is produced by vibrations and
rotations of atoms and molecules

5. Visible Light
• White light passes through a Prism and
separates into different colors
*ROY G BIV
*Red has the longest wavelength, lowest energy
*Violet has the shortest wavelength, highest
energy

6. • Light waves travel in straight lines from their
source.
• When a light wave strikes an object, the
light will do three things: transmit (go
through an object), reflect (to bounce off an
object), and/or absorb (the energy of the
light wave transforms into heat).

7. CLASSIFICATION OF MATERIAL BASED ON THE
AMOUNT OF LIGHT THEY TRANSMIT
1. TRANSPARENT- allow complete transmission of
light. Ex. Pure glass
2. OPAQUE- either reflect or absorb any incident
light.x. Wood, stone, etc.

8. 3. TRANSLUCENT-allow partial transmission of
light through them. A part of the incident light
may get reflected or scattered as it passes
through the interior of the material. Any object,
seen through a translucent material, appears
fuzzy or blurred.
Some examples are oily paper, tissue, some
plastics, etc.

9. Visible Light
Every object absorbs some visible light and
reflects some visible light
• Mirrors reflect almost all visible light

10. PRACTICAL APPLICATIONS:
• In order for you to see an object, visible
light must be reflected off it and meet
your eye
• Light gives light to the screen of most
electronic devices.
• Artificial lights like flashlights,lamp and
etc are any light source that produce light
instead of natural lights from the Sun

11. • White reflects all colors (ROY G BIV)
• Black absorbs all colors (ROY G BIV)
• Optical Fibers
- optical fibers in medicine is endoscopy,
a flexible tube with tiny camera that is used
to observe the internal parts of the body.