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6. The distance from the mirror to the principal focus is called the:
- focal length
- centre of curvature
- focus
- principal axis
7. The magnification of an image is calculated using the equation: magnification = object height ÷ image height
8. What is the change of direction when light enters a different medium known as?
- converging
- reflection
- refraction
- diverging
9. When light travels from air into a block of glass, it:
- bends towards the normal
- bends away from the normal
10. Blue light travels slower than red light in glass
11. An image formed by a converging (convex) lens is always a real image
12. A real image cannot be caught on a screen
13. Which of these factors does not affect the nature of the image formed by a lens?
- distance from the object to the lens
- colour of the object
- focal length of the lens
14. The further away an object is to the lens, the greater the distance must be from the lens to the film to form an image in focus
15. The image formed by a diverging lens is always virtual, upright and smaller than the object
16. Sound cannot travel through a:
17. What is the range of frequencies that a human can hear?
- 20-20000 Hz
- 20-200 Hz
- 20-2000 Hz
- 20-200000 Hz
18. Sound waves are what kind of waves?
- latitudinal
- converse
- longitudinal
- transverse
19. If the walls of a room are covered in soft fabric, the fabric will absorb sound instead of reflecting and no echoes will be heard
20. If the walls of a room have an uneven, rough surface, echoes will not be heard because the reflected sound is 'broken up'