Convex & Concave Ray Diagrams (OCR GCSE Physics A (Gateway Science Suite)): Flashcards
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Practise the cards
13 cards from this deck
How do lenses change images?
How do lenses change images?
By refracting light
Shape of convex lens
Shape of convex lens
Thicker in middle than at edges
Shape of concave lens
Shape of concave lens
Thicker at edges, thinner in centre
How convex lenses affect light
How convex lenses affect light
Refract it inwards towards principal focus
How concave lenses affect light
How concave lenses affect light
Cause it to diverge (spread out)
Focal length
Focal length
Distance from lens centre to principal focus
Convex: ray parallel to axis →
Convex: ray parallel to axis →
Passes through principal focus
Convex: ray from principal focus →
Convex: ray from principal focus →
Leaves parallel to axis
Concave: ray parallel to axis →
Concave: ray parallel to axis →
Appears to come from principal focus
What forms a real image?
What forms a real image?
Light coming together (e.g., on screen/retina)
Lens type producing real images
Lens type producing real images
Only convex lenses
What forms a virtual image?
What forms a virtual image?
Light rays diverging
Lens always producing virtual images
Lens always producing virtual images
Concave lenses