If the light rays are travelling from one medium to another they change their direction at the boundary between two mediums. When the light rays either bend or change their direction while passing ...

Please provide your email address to receive an email when new articles are posted on . The proportion of participants who achieved a visual acuity of 20/25 or better was similar for all types of ...

Please provide your email address to receive an email when new articles are posted on . Before you can successfully talk to patients and put them at ease with refractive surgery, you must be ...

There are different ways to investigate refraction in rectangular blocks. In this required practical activity, it is important to: make, measure and record the angles of incidence accurately using a ...