Lenses & ray diagrams (Edexcel GCSE Physics): Flashcards
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Practise the cards
15 cards from this deck
How lenses change images
How lenses change images
By refracting light
Shape of convex lenses
Shape of convex lenses
Thicker in middle than at edges
Another name for convex lenses
Another name for convex lenses
Converging lenses
Focal length definition
Focal length definition
Distance from lens centre to principal focus
Convex lens: ray parallel to axis
Convex lens: ray parallel to axis
Refracts through principal focus
Shape of concave lenses
Shape of concave lenses
Thicker at edges, thinner in centre
Another name for concave lenses
Another name for concave lenses
Diverging lenses
Effect of concave lenses on light
Effect of concave lenses on light
Causes light to diverge (spread out)
Real image definition
Real image definition
Light comes together to form image (e.g., screen/retina)
Lens type that produces real images
Lens type that produces real images
Only convex/converging lenses
Virtual image definition
Virtual image definition
Light rays diverge, object appears in different place
Concave lenses & virtual images
Concave lenses & virtual images
Always produce virtual images
Normal in ray diagrams
Normal in ray diagrams
Imaginary line perpendicular () to boundary
Light entering optically denser material
Light entering optically denser material
Bends towards the normal
Light entering less optically dense material
Light entering less optically dense material
Bends away from the normal