HOLIDAY HOMEWORK SCIENCE YEAR 8 SEPT 2014NAME : .1.Gabby arranged a torch, two cards and a screen as shown below. Light from the torch passed through holes in the cards and onto the screen.

(a)Why did a spot of light appear on the screen? Tick the correct box.Light can be split up intomany colours.

Light can travel throughempty space.

Light travels in straightlines.

Light travels very fast.

(b)Gabby moved card B to one side as shown below. The ray of light passed through the hole in card A and onto card B.Continue the ray of light from the torch to show where it would hit card B.Use a ruler.

(c)Gabby used a torch to shine a ray of light towards a mirror. Continue the ray of light to show how it reflects off the mirror. Add an arrow to show the direction of the reflected ray.Use a ruler.

2.Nadia is on her bicycle, waiting to pull out from a road junction. Michael is driving his car round the bend. A row of houses stops Nadia from seeing Michael's car.

(a)At what position will Michael's car be when Nadia first sees it?Tick the correct box.A B C D

(b)A row of shops was built opposite the junction. The shops have glass windows which act as a mirror.

Nadia could see Joan's motorbike reflected in the glass window.(i)On the diagram above, draw a ray of light to show how Nadia can see Joan's motorbike reflected in the glass window. Add arrows to the ray. Use a ruler. (ii)How does the glass window help to reduce the number of accidents?..........................................................................................................................................................................................................................3.Two cyclists are riding along a dark road at night. One is wearing black clothes and the otheriswearing light-coloured clothes.

A car is driving behind the two cyclists. Light from the car headlamp shines on the cyclists.(a)What happens to the light when it reaches the light-coloured clothes?. (b)On the drawing above, draw a ray of light to show how light from the headlamp reachesthe driver so that he can see the cyclist in the light-coloured clothes.Draw arrows to show the direction of the light. (c)What happens to the light when it reaches the black clothes?.

Write the correct number for the definition given.

Key wordDefinitionanswerOpaque

See through.7Translucent

You cannot see though it, but some light can get through.

Angle of incidence

No light can get through.

Absorption

Light is not reflected.

Angle of reflection

Gives out its own light.

Transparent

Does not give out its own light.

Refraction

Light bounces off an object.

Luminous

The angle between the reflected ray of light and the normal.

Non-luminous

The angle between the incoming ray of light and the normal.

Filter

The line drawn at ninety degrees to the mirror surface.

Reflection

When light changes direction (bends) as it goes through a substance.

Spectrum

An object used to separate white light into different colours.

Normal

The range of colours produced when white light is split up.

Prism

A material that only lets through certain colours; it absorbs the others.

Reflection WorksheetReflect these shapes in the given mirror lines (use a pencil and a ruler!):