Page 140 - Knowledge Organiser Yr8 24-25

Knowledge Base: Science 8.7 Electromagnetic Waves Year 8
7. Vision
7.1
What part of the eye refracts the light so that it focuses on the back of your eye?
The lens.
7.2
What part of your eye has lots of specialized cells that convert light into electrical signals?
The retina.
7.3
What is the hole called in the middle of your iris?
The pupil.
7.4
What part of the eye is a muscle that controls the size of your pupil?
The iris.
7.5
How can you describe the image that is formed at the back of your eye?
A real image, upside-down (inverted) and very small (diminished).
7.6
The eye is similar to what type of camera?
A pinhole camera.
5. Filters
5.1
What is a transparent object?
An object that transmits light and allows it to pass through.
5.2
How does a coloured filter work?
They will transmit some wavelengths of light and absorb others.
5.3
Describe how a green filter works.
If a white light is shone at a green filter, it will transmit green wavelengths light, but will absorb all red and blue wavelengths of light.
6. Refraction
6.1
What happens to light if it travels from a less dense to a more dense medium?
It will slow down and change direction towards the normal.
6.2
What happens to light if it travels from a more dense to a less dense medium?
It will speed up and change direction away from the normal.
6.3
What is dispersion?
When light is split, allowing you to see the separate colours.
6.4
Draw and label a diagram to show refraction through a glass block.
140