Give the details of 2 medical applications of Ultrasound.
Breaking down Kidney Stones & Pre-Natal Scanning.
2 of 18
What is the proper definition for Radiation?
Radiation is energy emitted from a source.
3 of 18
Give 2 factors that affect the intensity of radiation received.
Distance from the source & the medium it is passing through.
4 of 18
What is Refraction?
When radiation changes direction as it enters a different medium.
5 of 18
Describe the refraction of light by a converging lens.
The rays of light converge (move together) to focus at the lenses focal point.
6 of 18
Describe the refraction of light by a diverging lens.
The rays of light diverge (spread apart). The focal point is on the lens axis and can be traced back.
7 of 18
Describe the characteristics of an image formed from light from an object nearer to a converging lens than its focal point.
The image is virtual. The image is the correct way up. The image is bigger than the object. The image is on the same side of the lens as the object.
8 of 18
What is the top layer of the eye called?
The Cornea.
9 of 18
What causes Short-Sightedness?
The Cornea and Lens may be too powerful or the eyeball is too long. The Ciliary Muscles may not be able to contract enough to change the shape of the lens.
10 of 18
What is Long-Sightedness?
When the person cannot focus on near objects.
11 of 18
What type of lens should be used to correct Short-Sightedness?
A Diverging Lens.
12 of 18
What type of lens should be used to correct Long-Sightedness?
A Converging Lens.
13 of 18
How does Laser Correction work?
A laser is used to vaporise tissue, changing the shape of the cornea.
14 of 18
Give one advantage and one disadvantage of using Laser Correction to correct vision.
Laser Correction is a Permanent solution, Glasses & Contact Lenses will not be needed. The treatment is expensive. An Eye infection can occur.
15 of 18
What is Total Internal Reflection?
When the Critical Angle is greater than the Ange of Incidence. No light will leave the medium.
16 of 18
Describe how Total Internal Reflection is used in Optical Fibres.
Light Waves are reflected off the inner core of the fibre. For this to happen the fibre must be narrow enough to keep the angles above the critical angle.
17 of 18
Give 2 ways that Optical Fibres are used.
Medical Diagnosis (Endoscopes) & Communications.
18 of 18
Other cards in this set
Card 2
Front
Give the details of 2 medical applications of Ultrasound.
Back
Breaking down Kidney Stones & Pre-Natal Scanning.
Card 3
Front
What is the proper definition for Radiation?
Back
Card 4
Front
Give 2 factors that affect the intensity of radiation received.
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