1. Light is composed of waves and particles called:
A electrons
B quarks
C photons |
2. The visible spectrum of light from the longest to shortest wavelength is:
A violet, indigo, blue, green, yellow, orange, red
B infrared, ultraviolet, gamma, Xrays, microwaves
C red, orange, yellow, green, blue, indigo, violet |
3. The speed of light in a vacuum is:
A 300 000 km/s
B 300 000 m/s
C 1 000 000 m/s |
4. When light rays reflect off a plane mirror, the angle of incidence:
A is greater than the angle of refraction
B is less than the critical angle
C equals the angle of reflection |
5. The bending of light as it travels from one medium to another is:
A reflection
B imaging
C refraction |
6. When a light travels from a more dense material such as glass to a less dense material such as air, the light ray refracts:
A in the same direction as the incident ray
B away from the normal line
C towards the normal line |
7. When a light ray refracts from air to water, the angle of refraction is:
A less than the angle of incidence
B the same as the critical angle
C more than the angle of incidence |
8. A transparent object with flat surfaces that is used to separate the visible light spectrum into its different colours is called a:
A laser
B prism
C lens |
9. When light rays travel at a critical angle through an object such as optical fibre, they are:
Atotally internally reflected
Brefracted out of the fibre
Ctermed "critically angled" |
10. An image is called real or:
Aimaginary
Bvirtual
Cunreal |
11. An upside down image is called:
Alateral
Berect
Cinverted |
12. A magnifying glass is an example of a:
Aconvex lens
Bconcave lens
Cprism |
13. Convex lenses converge light rays to a:
Areal erect image
Bfocus
Cvirtual image |
14. An example of a diverging lens that spreads light rays is the:
Aconvex lens
Bconcave lens
Cconverging lens |
15. An object under white light which reflects green light and absorbs the other six colours of the spectrum will appear the colour of:
Amostly red-orange
Bblue-purple
Cgreen |