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. Which way does light bend when it travels from one medium into a denser one?
7. 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.
14. MATCHING -Match the position of an upright object in front of a concave mirror and the orientation of the image that is formed on the mirror.
object is farther away than twice the focal length from the mirror / a) no imageobject is at twice the focal length (point C) from the mirror / b) image is upside down and larger
object is just beyond the focal length of the mirror / c) image is upside down and smaller
object is at the focal point / d) image is upright and larger
object is in between the focal point and the lens / e) image is upside down and the same size
The Eye
15. Define the following terms:
Retina:
Iris:
Pupil:
Optic Nerve:
Photorecepters:
Ciliary Muscle:
Vitreous Humour:
Aqueous Humour:
Lens:
16. What kind of lens is found in the eye?
17. What does the term far-sighted mean? Which kind of lens can be used to correct far-sightedness?
18. What does the term near-sighted mean? Which kind of lens can be used to correct near-sightedness?
19. When a person is near-sighted it means their eye is too ______.
This causes the image to form ______the retina.
20. 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 PartFilm
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.
Visible Light
List the colours that make up light from longest wavelength to shortest.