SCIENCE 8 – LENSES WORKSHEET
NAME:
1) Match each Term on the left with the best Descriptor on the right. Each Descriptor may be used
only once
Term
Descriptor
Lens
A.
Point where the converging light rays meet
Focal length
B.
Lens that is thinner in the middle than at the edge
Convex lens
C.
A piece of transparent material that bends light
Concave lens
D.
Lens that is thicker in the middle than at the edge
Focal point
E.
Distance from the centre of the lens to the focal point
2) Compare and contrast concave lenses and convex lenses.
Draw the lens.
Do light rays
converge or diverge?
Is the image upright
or upside down?
Is the image smaller
or larger than the
object?
3) Will the image be
(a) larger, smaller or the same size as the object?
(b) upright or upside down?
4) Will the image be
(a) larger, smaller or the same size as the object?
(b) upright or upside down?
5) Will the image be
(a) larger, smaller or the same size as the object?
(b) upright or upside down?
6) Will the image be
(a) larger, smaller or the same size as the object?
(b) upright or upside down?
7) Sometimes people use the phrase double convex or double concave to describe a lens. They are
referring to the shape of each surface. To identify concave and convex lenses, it is the thickness of
the glass in the middle compared to the thickness at the edges that counts. Classify the following
lenses as convex or concave.