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Name: _______________________
Class: ________________________
Grade 8 Science: Light and Optics Review
What is Light?
1. Define the following terms:
Light:
Incandescent Light Source:
Fluorescent Light Source:
Phosphorescent Light Source:
Chemiluminescent:
Bioluminescent:
Luminous:
Non-Luminous:
2. Draw a ray diagram that shows how we see a table lamp
3. Which is more efficient, an incandescent light source or a Fluorescent Light?
4. Give an example of each of the following light sources:
a) Natural:
b) Artificial:
c) Chemiluminescent:
d) Bioluminescent:
e) Fluorescent:
f) Incandescent:
g) Phosphorescent:
h) LED
The Ray Model of Light
5. Define the following terms:
Ray:
Transparent:
Translucent:
Opaque:
Reflection:
Incident Ray:
Reflected Ray:
Normal Line:
Angle of Incidence:
Angle of Reflection:
Law of Reflection:
Refraction:
Angle of Refraction:
Diffuse Reflection:
The Wave Model of Light: (include diagram)
6. Fill in the following table:
Type of Behaviour
What happens to the
Nature of surface
What else happens?
light?
Absorption
Reflection
Refraction
7. Which way does light bend when it travels from one medium into a denser one?
8. Which way does light bend when travels from one medium into a less dense one?
Lenses
9. Define the following terms:
Double Concave lens:
Double Convex lens:
10. What happens to the light when it passes through a double concave lens? Explain and
draw a picture.
11. What happens to the light when it passes through a double convex lens? Explain and
draw a picture.
Mirrors
12. What happens to light when it reflects off of a concave mirror? Explain and Draw a
picture.
13. What happens to light when it reflects off of a convex mirror? Explain and draw a
picture.
The Eye
14. Define the following terms:
Retina:
Iris:
Pupil:
Optic Nerve:
Photorecepters:
Ciliary Muscle:
Vitreous Humour:
Aqueous Humour:
Lens:
15. What kind of lens is found in the eye?
16. What does the term far-sighted mean? Which kind of lens can be used to correct farsightedness?
17. What does the term near-sighted mean? Which kind of lens can be used to correct
near-sightedness?
18. When a person is near-sighted it means their eye is too _____________. This causes
the image to form ___________ the retina.
19. When a person is far-sighted it means their eye is too ______________. This causes
the image to form ____________ the retina.
20. Complete the following table:
Camera Part
Eye Part
Film
Diaphragm
Lens
Aperature
Optical Technologies
21. The ____________ telescope uses an objective mirror and an eyepiece. The
______________ telescope uses an objective lens and an eyepiece.
22. Binoculars are two _________________ telescopes placed side by side, using
_____________ to reflect light to the eyepiece.
Electromagnectic Spectrum
List the type of waves from longest wavelength to shortest wavelength.