Terms in this set (23)
How do lenses form images?
Lenses form images by refracting light and changing its direction.
What are the two main types of lenses?
Convex and concave
What is another word for convex lenses?
What is another word for concaving lenses?
Converging lens /Convex lens
Diverging lens/ Concaving lens
What is the focal length?
The distance from the centre of the lens to the principal focus.
What is the shape of the converging lens?
It bulges outwards.
What does the converging lens cause the rays of light to do?
Causes rays of light parallel to the axis to be brought together at the principal focus.
Where are the rays of light brought together in the converging lens?
The principal focus.
What happens to the rays of light in the converging lens?
They converge at the principal focus.
Where is the principal focus of a convex lens?
Rays hitting the lens parallel to the axis all meet.
Where is the principle axis found on the lens diagrams?
The line passing through the middle of the lens.
Lens diagram of a converging/convex lens
What shape is the concave/diverging lens?
What does the diverging lens cause the rays of light to do?
Where is the principal focus of a concave lens?
The point where rays hitting the lens parallel to the axis appear to all come from.
What can you do on a diverging lens diagram to check the principal focus?
Trace back the ray lines until they all meet up at a point behind the lens.
What is the first rule for refraction in a convex lens?
An incident ray parallel to axis refracts through the lens and passes through the principal focus on the other side.
What is the second rule for refraction in a convex lens?
An incident ray passing through principal focus refracts the lens and travels parallel to the axis.
What is the first rule for the refraction in a diverging lens?
An incident ray parallel to the axis refracts through the lens and travels in line with the principal focus.
What is the second rule for the refraction in a diverging lens?
An incident ray passing through the lens towards the principal focus refracts through the lens and travels parallel to the axis.
What is the third rule for the refraction in a diverging lens and convex lens?
An incident ray passing through the centre of the axis carries on in the same direction.
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