Starter quiz
- Which of the following is a definition of a translucent material?
- It lets no light through.
- It lets light through and you can see clearly through it.
- It lets light through and changes the colour of the light.
- It lets some light through, but you cannot see clearly through it. ✓
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- Which of the following describes a luminous object?
- an object that emits light ✓
- an object that scatters light
- an object that absorbs light
- an object that reflects light the way a mirror does
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- In diagrams, we can draw arrows to show the direction light travels, and where the light travels from and to. What are these arrows called?
- laser beams
- light arrows
- light beams
- light rays ✓
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- Which of the following is a definition of the word ‘image’?
- a real object
- an imaginary object
- a representation of a real object ✓
- a representation of an imaginary object
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- Which of the following statements is always necessary for you to be able to see an object?
- The object must be luminous.
- Light from the surroundings must hit the object.
- Light coming from your eyes must enter the object.
- Light coming from the object must enter your eyes. ✓
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- Which of the following statements explains why it is easier to see a dim lamp outdoors at night than in the day?
- The lamp’s light and the daylight cancel each other out.
- The lamp produces more light when its surroundings are dark.
- There is more contrast between the lamp and its surroundings at night. ✓
- More of the lamp’s light is absorbed by the surroundings during the day.
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Exit quiz
- Which of the following key terms means ‘turned upside–down’?
- converted
- diverted
- inverted ✓
- reverted
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- A ball moves through the air in daylight. The ball is not shiny and it is not black. Which of the following statements is correct?
- Every point on the ball’s surface emits light.
- Every point on the ball’s surface reflects light. ✓
- Light from each point on the ball’s surface travels straight outwards.
- Light from each point on the ball’s surface travels in many directions. ✓
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- Which of the following are needed for a pinhole camera to show a clear image?
- a lens
- a translucent screen at the back of the camera ✓
- a translucent screen at the front of the camera
- an object to look at that is very bright ✓
- an object to look at that may or may not be very bright
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- A pupil makes a pinhole camera and uses it to make an image of a bulb. Then the pupil makes the pinhole larger. In which of the following ways does this change the image?
- it gets larger
- it gets smaller
- it becomes clearer
- it becomes more blurred ✓
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- A pinhole camera makes an image of a filament bulb. Which of the following changes will make the image smaller?
- moving the camera closer to the bulb
- moving the camera further from the bulb ✓
- using a longer box for the pinhole camera
- using a shorter box for the pinhole camera ✓
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- A pupil holds up a pinhole camera at a short distance from a filament bulb that is switched on. Which of the following statements explains why an image of the bulb appears on the screen?
- An image of the bulb fits through the pinhole and lands on the screen.
- The pinhole changes the directions of rays so that they make an image.
- Each point on the screen is hit by light from every point on the bulb.
- Each point on the screen is hit by light from only one point on the bulb. ✓
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- A pinhole camera is an empty, closed box with a tiny hole on the front face and a screen on the back face.
- Light moves in straight lines from a light source, through the pinhole, to the screen at the back of a pinhole camera.
- Light from each different point on the object falls on a different single point on the screen, forming the image.
- The image produced by a pinhole camera is dim and inverted. Adding more holes produces multiple images.
- Making the hole larger makes the image brighter but blurred. More light passes through the hole in more directions.
Common misconception
Light from a lamp moves in parallel rays in a preferred direction towards the observer.
Overtly discuss the direction light rays move from a lamp by considering where light from a lamp can be seen from.
Keywords
Camera - A device that produces an image from light that enters it.
Image - A representation of an object.
Pinhole camera - An empty, closed box with a tiny hole on the front face and a screen on the back face.
Translucent - Describes a material that lets some light through, but through which objects cannot be seen clearly.
Inverted - Describes an image that is upside down.
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