1.What is the speed of light 300,000,000 ms answer

2.What is the law of reflection? “The angle of incidence = the angle of reflection” answer

3. What is a “normal” line answer A dotted line drawn at right angles to a surface

4. What is meant by the term refraction answer Refraction is when light slows down as it passes from air into glass. This can cause it to change direction.

5. What happens if light passes from air into glass at an angle to the normal? It slows down and bends towards the normal. answer

6. What is meant by the term “critical angle” The angle above which light in glass is not refracted out but is totally internally reflected answer

7. What type of lens brings parallel rays of light to a a focus point? A convex or converging lens answer

8. What does a prism do to a ray of white light? Splits it into a visible spectrum. answer

9.What is the name of the family of waves that all travel at the speed of light? The Electromagnetic Spectrum answer

10.What is the order of the sections in the EM spectrum starting with the lowest frequency? Radio &TV, microwaves, Infrared, Visible, Ultra Violet, X-Rays, Gamma Rays answer

11. Name a detector used to detect Infrared radiation. Thermal imaging sensor or photodiode or skin. answer

12. Which section of the EM spectrum has the highest energy ? Gamma rays Gamma rays answer

13. Are light waves transverse or longitudinal? Transverse answer

14. What kind of light is used to send information through a fibre optic cable ? Laser light Laser light answer

15. What type of lens would correct the vision of a short sighted person A concave or diverging lens. answer

16. What is the wavelength of a radio wave that has a frequency of MHz ? wavelength = v/f = 300,000,000 / 102,500,000 = 2.93m answer