893410
Pregunta 1
Pregunta
True or false? When X-rays are being taken, barium meals are used to provide a contrast medium to show soft tissues.
Respuesta
- True
- False
Pregunta 2
Pregunta
What does a charge-coupled device (CCD) do in X-ray imaging?
Respuesta
-
Create an electrical charge to start emission of X-rays
-
Convert X-rays to light to show an image
-
Create a computerised tomography, 3D, scan
Pregunta 3
Pregunta
What is the frequency of ultrasound waves?
Respuesta
-
Less than 20Hz
-
Between 20Hz and 20,000Hz
-
Greater than 20,000Hz
Pregunta 4
Pregunta
True or false? If an ultrasound transducer is used to measure the length of an eyeball, this is called an I-scan.
Respuesta
- True
- False
Pregunta 5
Pregunta
Which of these formulae is used to calculate the depth of a boundary using ultrasound?
Respuesta
-
depth = speed of wave * transit time
-
depth = 2 * speed of wave * transit time
-
depth = 0.5 * speed of wave * transit time
Pregunta 6
Pregunta
True or false? Snell's law states that the sine of the incident angle divided by the sine of the refractive angle is the same for each type of substance (e.g. it is the same in all glass).
Respuesta
- True
- False
Pregunta 7
Pregunta
Which way would the light ray refract if it entered a medium with a higher refractive index?
Respuesta
-
Away from the normal
-
Towards the normal
-
It would not refract
Pregunta 8
Pregunta
When will total internal reflection occur?
Respuesta
-
When the angle of incidence is less than the critical angle
-
When the angle of incidence is equal to the critical angle
-
When the angle of incidence is greater than the critical angle
Pregunta 9
Pregunta
True or false? The equation connecting refractive index and critical angle is n = sin c.
Respuesta
- True
- False
Pregunta 10
Pregunta
True or false? The principal focus of a converging lens is the point from which light rays spread out.
Respuesta
- True
- False
Pregunta 11
Pregunta
True or false? The formula to calculate magnification is image height/object height.
Respuesta
- True
- False
Pregunta 12
Pregunta
Which of these statements are true about the image formed by a converging lens where the object is beyond the principal focus?
Respuesta
-
Virtual
-
Real
-
Diminished
-
Magnified
-
Upright
-
Inverted
Pregunta 13
Pregunta
Which of these statements are true about the image formed by a converging lens where the object is between the lens and the principal focus?
Respuesta
-
Virtual
-
Real
-
Diminished
-
Magnified
-
Upright
-
Inverted
Pregunta 14
Pregunta
Which of these statements are true about the image formed by a diverging lens?
Respuesta
-
Virtual
-
Real
-
Diminished
-
Magnified
-
Upright
-
Inverted
Pregunta 15
Pregunta
Which part of the eye is light focused on?
Respuesta
-
Cornea
-
Iris
-
Retina
-
Lens
-
Ciliary muscles
-
Sclera
-
Suspensory ligaments
-
Pupil
Pregunta 16
Pregunta
Which part of the eye adjusts the thickness of the eye lens?
Respuesta
-
Cornea
-
Iris
-
Retina
-
Lens
-
Ciliary muscles
-
Suspensory ligaments
-
Sclera
-
Pupil
Pregunta 17
Pregunta
True or false? The range of vision is the distance between the near point and the far point; for the human eye, this is between 25cm and infinity.
Respuesta
- True
- False
Pregunta 18
Pregunta
What is the unit of power of a lens?
Respuesta
-
Watt
-
Dioptre
-
Farad
Pregunta 19
Pregunta
Which of these statements are true about myopia (short sight)?
Respuesta
-
The eyeball is too short
-
The eyeball is too long
-
The lens is too powerful
-
The lens is too weak
-
The image forms in front of the retina
-
The image forms behind the retina
-
A converging lens can correct it
-
A diverging lens can correct it
Pregunta 20
Pregunta
Which of these statements are true about hyperopia (long sight)?
Respuesta
-
The eyeball is too short
-
The eyeball is too long
-
The lens is too powerful
-
The lens is too weak
-
The image forms in front of the retina
-
The image forms behind the retina
-
A converging lens can correct it
-
A diverging lens can correct it
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