AQA Physics Paper 3 – Medical Physics Complete Exam with Questions and
Answers – 100% Solved
A high refractive index is good for spectacle makers because - ✔✔✔-it allows the glasses lens to
be flatter and thinner
a negative value of power is used for - ✔✔✔-a diverging lens
a positive value of power is used for - ✔✔✔-a converging lens
a virtual image is formed - ✔✔✔-where the rays appear to come from
Bones appear white on the radiograph because... - ✔✔✔-x-rays are absorbed more by bones
and teeth than by soft tissue.
Ciliary Muscles - ✔✔✔-Change the thickness of the lens
Cornea - ✔✔✔-transparent layer that protects the eye and helps to focus light onto the retina
CT scans are used less than ordinary radiographs - ✔✔✔-because the radiation dose received
by the patient is far higher and the cost is more expensive.
CT scans provide better images than radiographs because - ✔✔✔-they can distinguish between
soft tissue and provide a 3D image
focal length - ✔✔✔-the distance from the centre of the lens to the principle focus (focal point)
For TIR to occur - ✔✔✔-The incidence ray must be in the substance with the higher refractive
index and strike the boundary at an angle greater than the critical angle.
Answers – 100% Solved
A high refractive index is good for spectacle makers because - ✔✔✔-it allows the glasses lens to
be flatter and thinner
a negative value of power is used for - ✔✔✔-a diverging lens
a positive value of power is used for - ✔✔✔-a converging lens
a virtual image is formed - ✔✔✔-where the rays appear to come from
Bones appear white on the radiograph because... - ✔✔✔-x-rays are absorbed more by bones
and teeth than by soft tissue.
Ciliary Muscles - ✔✔✔-Change the thickness of the lens
Cornea - ✔✔✔-transparent layer that protects the eye and helps to focus light onto the retina
CT scans are used less than ordinary radiographs - ✔✔✔-because the radiation dose received
by the patient is far higher and the cost is more expensive.
CT scans provide better images than radiographs because - ✔✔✔-they can distinguish between
soft tissue and provide a 3D image
focal length - ✔✔✔-the distance from the centre of the lens to the principle focus (focal point)
For TIR to occur - ✔✔✔-The incidence ray must be in the substance with the higher refractive
index and strike the boundary at an angle greater than the critical angle.
