OPTICS REVIEW BELL RINGER
STATIONS
1. Optics Definitions
2. Diagram and Properties of a Plane Mirror
3. Pinhole Camera Problem
4. Curved Mirror Calculation
5. Curved Mirror Diagram
6. Refraction
7. Lens Calculation
8. The Human Eye
STATION 1: OPTICS VOCABULARY
Write the word that corresponds to each
definition or statement.
a) The name of the ray that strikes a
surface.
b) The location where reflected rays cross
the principal axis on a concave mirror.
c) The angle where total internal
refraction will occur (angle of refraction
is 90o).
d) The ratio of image height to object
height.
e) A type of light source produced by some
chemical reactions (e.g. glowsticks)
f) A type of light source produced by very
hot objects (e.g. the Sun).
g) The characteristic that distinguishes
different forms of electromagnetic
waves (e.g. red, blue, X-rays etc.)
STATION 2: PLANE MIRRORS
a) Sketch this diagram on your page.
Construct a ray diagram to show how
your eye sees an image in a flat (plane)
mirror.
b) State 5 properties of the image formed by
this mirror.
STATION 3: PINHOLE CAMERA PROBLEMS
a) Sketch a pinhole camera diagram and
label the diagram as to locate do (distance
to object), di (dstance to image), ho
(height of object) and hi (height of image).
b) On the west coast of British Columbia, the
giant Sitka spruce can grow to a height of
100m (the length of the football field!). If
a 20 cm long pinhole camera takes a
picture of a 100 m tall Sitka spruce from a
distance of 2 km away, how large is the
image?
STATION 4: CURVED MIRROR CALCULATIONS
a) A mirror with a focal length of -5 cm
produces an image of an object 25 cm
away. Calculate the image distance.
b) Is this a converging or diverging mirror?
c) Is this a convex or concave mirror?
d) What is the magnification of the image?
e) Is the image real or virtual?
f) Is the image upright or inverted?
STATION 5: CURVED MIRROR DIAGRAM
a) Draw a ray diagram of a concave mirror
with a focal length of 5 cm and an object
at 4 cm.
b) State 3 properties of the image.
c) Draw a ray diagram of a convex mirror
with focal length – 5 cm and an object at 4
cm.
d) State 3 properties of the image.
STATION 6: REFRACTION
a) A ray of light in air enters a square piece
of cubit zirconia (n = 2.15) with an
incident angle of 20o. Calculate the angle
of refraction for light entering and leaving
the zirconia crystal.
b) Draw a ray diagram to represent what is
happening in part a).
c) What is the critical angle for light
travelling from zirconia back into air?
STATION 7: LENS CALCULATIONS
a) A student placed a candle 25 cm from
a convex lens and produced a real,
inverted image that was 75 cm from
the lens. What is the focal point of
this lens?
b) What is the magnification of the lens?
c) If the candle flame was 5 cm tall, how
tall is the image?
STATION 8: THE HUMAN EYE
a) What part of the eye form refracts light?
b) What part of the eye is the site of image
formation?
c) What part of the eye creates the shape?
d) What part of the eye adjusts the amount
of light entering?
e) What condition does this person suffer
from?
f) How can it be corrected using lenses?
g) Sketch a ray diagram to show how
corrective lenses will work for this
condition.