Scott’s blog…

• describe how optical fibre may be used in medical applications

Optical fibres can be used in endoscopes. These flexible tubes contain optical fibres and can be passed via the mouth in

• identify the traditional medical techniques that optical fibres might replace

• Evaluate the benefits of fibre optic technology to medicine

• Analyse why red sunsets can sometimes be more impressive when there is more dust or pollution in the air than usual.

Blue light is scattered more than other particles into the atmosphere which alters the direction of the light rays. When viewed against the dark background of space, the sky then appears blue. At sunset and sunrise the sunlight travels further and only the red and orange reaches us,

• Describe what happens inside water droplets to cause a rainbow and explain how you can tell whether a rainbow is a primary or secondary.

Small droplets of water act as a prism and refract the light that goes inside. Droplets higher in the sky refract red whereas lower skies refract blue. Green will bend lower down causing a rainbow effect. Primary rainbows start with red at the top and secondary rainbows start with red at the bottom.

• what causes long and short sightedness defect?

This is caused when the iris, lens or retina are damaged. Depending on the situation, you will either be short sighted or long sighted.

• the symptoms displayed?

Symptoms are shown and become obvious when close or far objects are blurry or hard to read. Normally at an optometrist, a sheet is shown and you will have to read the letters out loud. The letters become smaller after every row.

• propose what sort of lens may be used to correct each vision.

Concave mirrors are used to correct the short and long sightedness. The vision could be corrected depending on the thickness.