Optics

In this topic, we learnt about lenses. we learnt about the different lenses and what are their uses. We also learnt about reflection and refraction. These two are completely two different things. For reflection, it means the light rays reflecting on a surface. The angle of incident and angle of reflection will be the same. For refraction it means the light rays passing from a less dense medium to a denser medium. The angle of incident will not be the same as the angle of refraction. Critical angle is something that we learnt. It is when the angle of refraction is 90 degrees. Thus the angle of incident will be the critical angle. We also learn about total internal reflection. It is when the incident ray is in the less denser medium. When the angle of incident is bigger than the critical angle, total internal reflection occurs.