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Preview questions
1. What is light?
A form of energy · A type of sound · A solid object · A liquid substance
2. Which of the following is a source of light?
Moon · Stars · Sun · All of the above
3. What is the speed of light in vacuum?
3 x 10^8 m/s · 3 x 10^6 m/s · 3 x 10^5 m/s · 3 x 10^4 m/s
4. What type of wave is light?
Transverse wave · Longitudinal wave · Surface wave · Mechanical wave
5. Which phenomenon explains the bending of light?
Reflection · Refraction · Diffraction · Dispersion
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