Lenses & ray diagrams (Edexcel GCSE Physics Combined Science): 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 lens
Shape of convex lens
Thicker in middle than at edges
Another name for convex lens
Another name for convex lens
Converging lens
What is the principal focus
What is the principal focus
Point where light rays converge or appear to come from
What is focal length
What is focal length
Distance from lens centre to principal focus
Convex lens: ray parallel to axis goes...
Convex lens: ray parallel to axis goes...
Through the principal focus
Shape of concave lens
Shape of concave lens
Thicker at edges, thinner in centre
Another name for concave lens
Another name for concave lens
Diverging lens
What concave lenses do to light
What concave lenses do to light
Cause it to diverge (spread out)
What is a real image
What is a real image
Light comes together to form image on screen/retina
Which lens can produce real images
Which lens can produce real images
Only convex/converging lenses
What is a virtual image
What is a virtual image
Light rays diverge; object appears in different place
Which lens always produces virtual images
Which lens always produces virtual images
Concave/diverging lenses
Ray through middle of lens does what
Ray through middle of lens does what
Doesn't bend
What is the normal in ray diagrams
What is the normal in ray diagrams
Line perpendicular () to the boundary