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Science Week 5LO: understand how the human eye works clip is a look at the human eye and how it works. The BBC illustrate the functions of the eye with models, film clips and magnified images. The eye is a ball with a hole at the front, the pupil, which lets in light. Inside the eye is a lens which focuses the light onto a surface at the back of the eyeball. This surface is called the retina and is made up of special cells which detect light and send messages to our brain, allowing us to see. When we have our eyes tested, an optician shines a light into our eye and uses a magnifying lens. This shows the optician the blood vessels on the surface of the retina and the light-sensitive cells. A human eye has more than a million light-sensitive cells.Activity: How we see You can research the answers online too then complete the empty boxes on the following page. The answers are on the page after for you to check.-3810016129000extra labels so maybe you could use a laptop or Ipad if you have one to help you label.left37338000Answers:489585022352000LO: To be able to describe how we see different colours in bubbles using scientific terminology Activity: Investigate Bubbles As rainbows are a feature of lockdown we thought we’d look for them in bubbles. This website has the experiment that is written out below, and explains why we see bubbles. There are two different ways to make bubbles, just in case you don’t have a torch and a straw.See if you can blow some soap bubbles on top of a torch and plastic lid, then identify which colours you can see. Things you need: Small clear plastic lid (e.g. from yoghurt container) Tape, torch, washing up liquid, water measuring cylinder or beaker, spoon, straw A darkened room Method: 1. Mix 2 or 3 squirts of washing liquid in 200ml water (you may wish to experiment with this to get the best bubbles!) 483870061595002. Tape the plastic lid onto the end of the torch. 3. Dip your finger in the bubble liquid and wet the lid.4. Switch on the torch after making the room dark.5. Put a spoonful of the bubble liquid on the lid. 6. With a straw dipped into the bubble liquid on the lid, blow one big bubble dome that covers the whole lid.7. Hold the torch so that the bubble dome is just above your eyebrows. 8. Watch the swirling colours. 9. If you place the end of a wet straw into the bubble dome & blow very gently, you can move the colours around. 10. Which colours can you see?right11938000OPTION TWO TO MAKE BUBBLESYou will need: An empty clear bottleWashing up liquidWaterA sinkAn overcast day (works best)Fill the bottle about three quarters full with waterAdd a squirt of washing up liquidright45085004762526987500Quickly tip the bottle and pour the water out fast.left33337500You will find that the bottle is left full of bubbles. 248221571501000These will look clear and normal to begin with but place the bottle on a windowsill and wait and watch over the next 30 seconds.You will find that the bubbles will start to show signs of colour that will get stronger and stronger and that each bubble will look like it has been coloured like a rainbow!WHY CAN YOU SEE A RAINBOW IN BUBBLES?Visible Light from the sun is known as white light. It contains a range of colours all with different wave lengths that when together form white light.When white light from the sun shines through the film of the bubbles, the light is reflected and dispersed, splitting white light into its different wave lengths revealing all the colours of the rainbow!OPTIONAL taskCan you explain how we see rainbows in bubbles to someone? You could do a poster or write up what you have done. Email it in to your teacher for Dojo points. You can find videos and information online to explain this is more detail if you wish.Activity: RefractionWatch to see how light bends.A demonstration of what happens when light travels through water or glass. Light travels and bounces off surfaces into our eyes. When light travels from air through water, glass or anything that lets light through, it gets bent. This bending is called refraction.OPTIONAL DIY EXPERIMENTS (ASK PERMISSION FROM AN ADULT FIRST!) ................
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