1. To know how to use a microscope.

2. To learn the parts of a microscope and their function.

Learning and Teaching Activities

(Cognition)

1. Handle hand lenses and know that they magnify.

2. Learn how to set up a microscope.

3. Learn the main parts of the microscope.

4. Learn how to set up a slide.

Children will be able to:

1. Memorise key vocabulary.

2. Memorise and use phrases.

3. Demonstrate the use of a handlens.

4. Use the term magnification correctly.

5. Name the parts of the microscope.

6. Demonstrate the correct setting up a microscope.

7. Locate the lenses on a microscope.

1. Present a magnifying glass to the class and discuss what it is. Issue lenses and little pieces of neswaper, one between two, and set the question - What do lenses do? Explore ideas. Predict what will happen when 2 lenses are put together. Now pair up with another couple, put the lenses together and see if it is correct.

2. Some guidance to the arrangement of lenses could now be given:

- Hold one magnifying glass a short distance above the paper. The image of the print will look larger.

- Place the second lens between your eye and the first lens.

- Move the second lens up and down slowly until the print comes into sharp focus.

- The print should appear even larger.

3. Pupils should have found that the two lenses together made the text bigger. Give the term magnification as increasing the view of an object. Present microscope to the class and discuss. Explain that you are going to show them how to handle a microscope correctly and that they are going to make, view and draw slides.

4. Tell pupils that they are going to do the folowing activity: setting up the microscope.

- Issue blank diagrams of the microscope and labels and in pairs or trios, pupils attemt to name all the parts.

- Elicit that the function of the microscope is to enable us to see clearly, objects that are too small for us to see normally and that it has a number of lenses built in. Identify these on the microscope, starting with the three objective lenses on the revolvoing turret. Point out the differences in size/colour and demonstrate the lenses swivelling into place. Discuss why having three lenses may be better than one. Explain that addition to these three the microscope has another lens. Discuss possible locations for this before identifying it the eye piece.

- Use flashcards to explain the magnification on the microscope. The eye piece can magnify ten times the original size known as x10, the smallest objective lens magnifies at x4, therefore the object is being viewed 40 times the original size, written as x40.

- In order to see the size clearly, a source of light is necessary- encourage pupils to suggest how light enters the microscope. Point to the mirror, the space in the stage, the clear lenses and the eye piece.

- Return to their labelled diagrams and tick off each correctly identified part.

- Demonstrate setting up the microscope. Reinforce the need for clean hands, avoid touching the lenses and only hold the mirror at the sides as many fingerprints or dust will impede their views.

- Now demonstrate setting up a slide. Explain that clear glass is used to let light through- See how to make a slide.

- Working in pairs pupils set up a slide each of graph paper, view at each magnification and record on worksheet. My slides.

- Discuss findings- How many squares can be seen at x40?, x100?, x400? which magnification was the easiest/most difficult to set up?

- Children complete worksheet 21.

Worksheet Key

Language of learning

1. Key words needed: microscope, lens, magnify, handle, focus adjuster, eye piece, base, stage, lenses. mirror.

2. Key phrases needed:

- Lenses make things look bigger.

-Two lenses together magnify more than one lens.

- A microscope has a number of lenses.

- The main parts of the microscope are...

Language for learning

1. Language

- How to describe how light travels.

2. Learning how to learn.

- Understanding instructions.

- How to deal with not understanding.

- The language to ask and answer questions.

Language through learning

- Language to carry out worksheet tasks.

The careful and safe handling of the microscope.