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Medical Application of Physics

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Paul Sheffield

on 15 September 2015

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Transcript of Medical Application of Physics

Medical Application of Physics
Refractive index

Last lesson
P2.6.2 Nuclear fusion
a) Nuclear fusion is the joining of two atomic nuclei
to form a larger one.
b) Nuclear fusion is the process by which energy
is released in stars.
c) Stars form when enough dust and gas from space
is pulled together by gravitational attraction. Smaller
masses may also form and be attracted by a
larger mass to become planets.
d) During the ‘main sequence’ period of its life cycle
a star is stable because the forces within it are
e) A star goes through a life cycle. This life cycle is
determined by the size of the star.
Refraction !!!
Explain this diagram
use the following words
Key Knowledge
P3.1.3 Lenses
a) Refraction is the change of direction of light as it
passes from one medium to another.

b) A lens forms an image by refracting light.

c) In a convex or converging lens, parallel rays of
light are brought to a focus at the principal focus.
The distance from the lens to the principal
focus is called the focal length.

refractive index = sin i /sin r

Refractive index
Snell's law
Calculate the mean value for your glass block
this is the refractive index
f) Fusion processes in stars produce all of the
naturally occurring elements. These elements may
be distributed throughout the Universe by the
explosion of a massive star (supernova) at the end
of its life
Candidates should be able to explain why the early
Universe contained only hydrogen but now contains a
large variety of different elements.
The term ‘radiation pressure’ will not be required.
Candidates should be familiar with the chart on the next
page that shows the life cycles of stars.
Candidates should be able to explain how stars are
able to maintain their energy output for millions of years.
Candidates should know that elements up to iron are
formed during the stable period of a star. Elements
heavier than iron are formed in a supernova.
light ray
P.1 Kowledge

P1.5.2 Reflection
a) The normal is a construction line perpendicular to the
reflecting surface at the point of incidence.
b) The angle of incidence is equal to the angle of
c) The image produced in a plane mirror is virtual.
Medical Physics
Critical angle
total internal reflection
Can you eeplain this?
Critical angle
the angle at which the refractive ray emerges along the boundary
Beyond the critical angle the light is said to be totally internally reflected
Finding the Critical angle
sin 90 = n X Sin c
1 = n X sin c
Full transcript