Revision - Sound waves, resonance, dispersion of white light, optical instrument

Revision

• Sound waves, 
• resonance, 
• dispersion of white light, 
• optical instrument

By the end of this lesson, students should be able to:

· different between sound waves and light waves;

· state and explain the characteristics of sound waves;

· define resonance and differentiate between resonance and forced vibration;

· define the dispersion of white light and differentiate between it and deviation of light with illustrations of the formation of a rainbow;

· explain the working principle of certain optical instruments like a simple periscope, microscope (simple or complex), and telescopes.