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- How do your eyes change
when you go from light to dark? (lesson 12a)
- Explain how you can see
this writing. (12a)
- State the laws of
reflection. (12b)
- An object is placed 10cm
in front of a mirror. Where does its image appear to be? (12b)
- What are the 2 types of
curved mirror called? (12b)
- What is an inverted
image? (12c)
- How can you make the
image in a pin-hole camera brighter? (12c)
- What is the disadvantage
of making the image brighter in a pin-hole camera? (12c)
- All sounds are made by
---------- and they travel through the air as -----. (12d)
- Why do you see a lighting
flash before you hear the thunder? (12d)
- Why do we hear echoes?
(12d)
- What do we call sound
that is too high for humans to hear? (12d)
- What part of the ear
vibrates when sound enters it? (12e)
- How many small bones are
there in the ear? (12e)
- What is the name of the
spiral containing liquid in the inner ear? (12e)
ANSWERS
- Your pupils get larger.
- Light rays are reflected
from the page into the eye. The rays are focussed to an image on the retina
and then signals are sent to the brain.
- The angle of incidence is
always equal to the angle of reflection.
- 10cm behind the mirror.
- Convex and concave.
- An upside-down image.
- Make the pi-hole larger.
- The image gets blurred as
the the hole is made larger.
- Vibrations, waves.
- Light travels faster than
sound.
- Sound is reflected off
objects.
- Ultrasonic sound
(ultrasound).
- The ear-drum.
- 3
- The cochlea.
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