Well, we are learning light this term. There are several components for light. They are reflection, refraction, lens and colours. We did not manage to finish up with lens and colour completely and will be brought to next term. At the start of this term, I was given a whole set of 9 science worksheets to be completed by the end of this term and they are all about light. Since out online lessons now are up to the students to choose, I had set aside 2 worksheets to be done every week so that I can finish all the worksheets on time before the term 3 test. I thought all the components of light would be tested but in the end, only reflection was tested. Thus, I decided to focus more on the 1st 3 worksheets as they are all on reflection.
Under reflection, the most challenging part for me was to draw accurate diagrams as my drawing is always too off from the answer. I totally gave up on the "actual" way of drawing and decided to draw using the "play cheat" method. This "play cheat" method is to work backwards and start to draw from the image and trace back according. This would ensure the accuracy of the diagram. On the other hand, the only rule to remember for reflection is that the angle of incidence = angle of reflection and also the different characteristics of plane mirror, concave mirror and convex mirror. After understanding how a light ray works through the practicals done, all these memorizing will be quite easy.
A picture of reflection:
Since we also learnt refraction, I shall talk about the learning experience of refraction. I finished the refraction worksheet before I do the practical so I am quite confused with this topic. But after trying the practical, all my questions and confusions are totally gone! Nothing is better than seeing how the light ray works by itself. Refraction refers to the bending of light when the light ray enters a different medium. When I try it out with different shapes of blocks, I observed how the light ray bend as it enters a denser medium from air and how the lights bend back as it emerge back into air. The emergent ray comes out parallel with the incidence ray when the surface that it enters and exits is parallel. An example with be a rectangular block. This is the basics of refraction before we move on to critical angle and total internal reflection. Actually, these are not very complicated if you know how refraction and angle of refraction works. Critical angle is when the emergent ray goes along the edge of an object and the angle of emergent is at 90 degree. The critical angle differs from different object. Total internal reflection occurs when the light ray enters a denser medium and the angle of incidence is larger than the critical angle, then, the light ray will be totally reflected back and there will be no emergent ray at the edge. Simple?
A picture to show how refraction works:
For lens and colours, I could not talk much about them as I am also no very sure with the facts and will ask my science teacher more about them as she goes through them again in term 4. I know that lens is very complicated as there can be 6 different cases for lens and there are different uses for all 6 cases. Haizzz..... EOY is approaching and I am still confused with lens..... I think colours would be easier to understand but who knows.....
Under reflection, the most challenging part for me was to draw accurate diagrams as my drawing is always too off from the answer. I totally gave up on the "actual" way of drawing and decided to draw using the "play cheat" method. This "play cheat" method is to work backwards and start to draw from the image and trace back according. This would ensure the accuracy of the diagram. On the other hand, the only rule to remember for reflection is that the angle of incidence = angle of reflection and also the different characteristics of plane mirror, concave mirror and convex mirror. After understanding how a light ray works through the practicals done, all these memorizing will be quite easy.
A picture of reflection:
Since we also learnt refraction, I shall talk about the learning experience of refraction. I finished the refraction worksheet before I do the practical so I am quite confused with this topic. But after trying the practical, all my questions and confusions are totally gone! Nothing is better than seeing how the light ray works by itself. Refraction refers to the bending of light when the light ray enters a different medium. When I try it out with different shapes of blocks, I observed how the light ray bend as it enters a denser medium from air and how the lights bend back as it emerge back into air. The emergent ray comes out parallel with the incidence ray when the surface that it enters and exits is parallel. An example with be a rectangular block. This is the basics of refraction before we move on to critical angle and total internal reflection. Actually, these are not very complicated if you know how refraction and angle of refraction works. Critical angle is when the emergent ray goes along the edge of an object and the angle of emergent is at 90 degree. The critical angle differs from different object. Total internal reflection occurs when the light ray enters a denser medium and the angle of incidence is larger than the critical angle, then, the light ray will be totally reflected back and there will be no emergent ray at the edge. Simple?
A picture to show how refraction works:
For lens and colours, I could not talk much about them as I am also no very sure with the facts and will ask my science teacher more about them as she goes through them again in term 4. I know that lens is very complicated as there can be 6 different cases for lens and there are different uses for all 6 cases. Haizzz..... EOY is approaching and I am still confused with lens..... I think colours would be easier to understand but who knows.....