The last subject for science, Physics. Physics, in my opinion, is the easiest subject of all the science subjects, because physics is about understanding concepts and applying formulas, one which I am quite good at because of my good math skills. The topics are reflection, refraction and lens.
For reflection, there is one main law. "The angle of incidence is equal to the angle of reflection." Following this law, we can easily find out how to draw a light ray and can predict where a light ray will end up at when reflected on a plane mirror.
However, reflection on a convex/concave mirror is not so simple. To calculate the angle of the reflection, a tangent must be drawn to the curve of the mirror and then the tangent can be treated like a plane mirror. This will allow one to be able to calculate the angle of reflection for light rays that are reflected by convex/concave mirrors.
Lastly, total internal reflection. This happens when light is travelling from an optically denser medium to a optically less dense medium, and when the angle of incidence of the light ray is greater than the critical angle. This reflection is just like the mirrors mentioned before.
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