# The Electromagnetic spectrum (Forces, Electricity and Waves)

The Learning Log

After each lesson complete a learning log at the back of your jotter. A learning log should include at least two of the following headings, especially 5): The headings should start ...
1) I really enjoyed ....
2) I want to find out more about ....
3) I was unsure about ... .
4) I was surprised by ...
5) I learned that ...

The Young Scientist's Handbook .
and see page 4.

In this topic we are aiming to achieve the following outcome..

## Homework 1..The electromagnet spectrum

1) List the members of the electromagnetic spectrum from the most energy to the least.
2) State one health benefit of i) Infra-red, Ultraviolet and X-Rays.

## Homework 2..Investigating refraction 1

3) A ray of light is entering the glass blocks below. Copy them out and complete the path of the ray through the block. Use a ruler and use arrows!

## Homework 3..Investigating refraction 2

Part 1
In class we investigated focal length and lens thickness. For this activity we stuck paper to a wall facing the window and collected lenses of different thicknesses.
1) Using a diagram and three straight rays of light show what is meant by the focal length of a lens.
2) For this activity write an i) aim ii) hypothesis and iii) method.
3) Mr Rosenberg has filled in the Focal length column incorrectly. Draw the table as it should be drawn

Lens Thickness Focal Length (cm)
Very Thin 5
Thin 8
Medium 30
Thick 24
Very Thick 10

4) Put the data above into a labelled bar chart like the one below
5) Using your bar graph Write down the conclusion for this activity.
Part 2
6. An elderly couple enter an optician. The man is severely long-sighted and the woman is mildly long-sighted. i) Redraw the eye diagrams below to show how the rays meet for both persons.

ii) Which lens from the table above would you use for each person? A good answer will be supported with a diagram.

## Homework 4..The Hubble Telescope

1) Watch the short clip on the Hubble Telescope and answer the questions that follow.