Sci 8 Unit C 1.0 Knowledge about Light

What instruments use lenses or mirrors to collect and focus light from distant objects?

• Microscopes
• Fibreoptics

• Telescopes
• Lasers

The image shows light changing direction as it passes from one clear medium to another. This optical effect is a result of

• Refraction

• Reflection

• Transmission

• Absorption

Refraction is when light__________.

• bounces off an object or material.
• changes speed in different media, causing bending.
• when light travels faster than 300,000 km/s
• is absorbed by a material.

How does light travel from a source?

• In a curved line

• at 100 000 km/s

• In a straight line

When all 3 primary light colors: blue, green, red are mixed which color is produced?

• black

• magenta

• white

• cyan

A student uses an optical device, then decides to take it apart to learn more about how it works.

The student's observations are listed below:

• 1. the device has two lenses

• 2. a lens is in the eyepiece

• 3. an objective lens collects the light

• 4. the image is inverted

• 5. the device consists of one long tube

• reflecting telescope

• refracting telescope

• microscope

• binoculars

A student uses an optical device, then decides to take it apart to learn more about how it works.

The student's observations are listed below:

• 1. the device has one lens

• 2. a lens is in the eyepiece

• 3. a mirror redirects the image to the eyepiece

• 4. the image is inverted

• 5. a mirror focuses the image

• reflecting telescope

• refracting telescope

• microscope

• binoculars

Categorize the following theories of light as Correct or Incorrect.

Groups:

(a) Correct

,

(b) Incorrect

• the speed of light is 150 000 km/s

• white light is a mixture of all colours of light

• incoming angle of the beam equals the reflected

  beam of light when hitting a mirror

• our eyes give off light to iilluminate objects

• light chcnges direction when it travels from air to water

• light is given off by water particles

A student uses an optical device, then decides to take it apart to learn more about how it works.

The student's observations are listed below:

• 1. the device has four lenses

• 2. there are two eyepiece lenses

• 3. there are two objective lenses that collect light

• 4. the image is not inverted

• 5. the device consists of two tubes with prisms

• reflecting telescope

• refracting telescope

• microscope

• binoculars

Light bouncing off a mirror is an example of...

• Refraction
• Reflection
• Transmission

• Absorption