See your GP if you have: 1  persistent or worrying symptoms that could be caused by haemochromatosis â particularly if you have a northern European family background. 2  a parent or sibling with haemochromatosis, even if you don't have symptoms yourself â tests can be done to check if you're at risk of developing problems.
The reflection of light can be roughly categorized into two types of reflection: specular reflection is defined as light reflected from a smooth surface at a definite angle, and diffuse reflection, which is produced by rough surfaces that tend to reflect light in all directions (as illustrated in Figure 1).
The main problem involving reflector telescopes is the spherical aberration, which is caused by the focal length not being the same for wider parts of the mirror. This can be corrected by using parabolic mirrors instead of spherical mirrors. What is the difference between refractor and reflector telescopes?