Optometrists exam questions and answers
Question:
For an object situated anywhere in front of a convex
mirror, the image has the following characteristics:
Options:
a. it is erect
b. it is laterally inverted
c. it is real
d. it is magnified
e. the image is found within the centre of curvature
a. it is erect
b. it is laterally inverted
e. the image is found within the centre of curvature
Question:
The following are true about total internal reflection:
Options:
a. it does not occur when light travel from a medium with
lower refractive index to one with higher
index
b. it occurs when the incident ray exceeds the critical
angle
c. it is used in binoculars
d. a contact lens with a lower refractive index than the
cornea may be used to visualize the
anterior chamber
angle
a. it does not occur when light travel from a medium with
lower refractive index to one with
higher index
b. it occurs when the incident ray exceeds the critical
angle
c. it is used in binoculars
Question:
With regard to refraction:
Options:
a. it is a change in direction of light when it passes
from
one transparent medium into another
of different
optical density
b. light is deviated away from the normal when it enters
an optically dense medium from a less
dense medium
c. the velocity of light is changed during refraction
d. the wavelength of the light is changed during refraction
a. it is a change in direction of light when it passes
from
one transparent medium into another
of different
optical density
c. the velocity of light is changed during refraction
d. the wavelength of the light is changed during refraction
Question:
The following are true about the refractive index of a
material:
Options:
a. the absolute refractive index of a material is always
greater than its refractive index
b. the refractive index of a material is usually measured
with ultraviolet light
c. the refractive index of a medium differs for light of
different wavelengths
a. the absolute refractive index of a material is always
greater than its refractive index
c. the refractive index of a medium differs for light of
different wavelengths
Question:
With regard to the refractive index of a medium:
Options:
a. it is the ratio of sin i to sin r . i is the angle of
incidence of the light and r is the
refracted angle
b. it can be calculated by knowing the velocity of
light in air and its velocity in the
medium
d. the lens accounts for most of the refractive
power of a human eye due to its
higher
refractive index
a. it is the ratio of sin i to sin r . i is the angle of
incidence of the light and r is the
refracted angle
b. it can be calculated by knowing the velocity of
light in air and its velocity in the
medium
Question:
The following are true about prism:
Options:
a. its orientation is defined by its apex
b. light is deviated towards the apex
c. light with shorter wavelength is deviated more than
light with longer wavelength
d. the angle of the prism apex is called the refracting angle
c. light with shorter wavelength is deviated more than
light with longer wavelength
d. the angle of the prism apex is called the refracting
angle
Question:
The image formed by a prism is:
Options:
a. erect
b. magnified
c. laterally inverted
d. virtual
e. deviated towards the apex
a. erect
d. virtual
e. deviated towards the apex
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Question:
The angle of deviation of a prism is determined by:
Options:
a. the refracting angle
b. the angle of incidence of the ray
c. the refractive index of the prism material
d. the width of the base
a. the refracting angle
b. the angle of incidence of the ray
c. the refractive index of the prism material
Question:
The following are true about prisms:
Options:
a. they can control torsional diplopia
b. they can control diplopia caused by an eye which is
deviated out and up
c. the prism power can be calculated form the refracting
angle alone
b. they can control diplopia caused by an eye which is
deviated out and up
Question:
The Fresnel prisms:
Options:
a. reduce the weight of conventional prisms
b. are made up of a series of small prisms
c. are usually made up of polyvinyl chloride
d. reduce the visual acuity mainly through light scattering
at the groove edges
a. reduce the weight of conventional prisms
b. are made up of a series of small prisms
c. are usually made up of polyvinyl chloride
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Study the rationale and understand the concept in each question rationale.
so that you can apply those concepts in your questions. always remember questions will not be ask direct, so always better to know each topic thoroughly.
When ever you are learning a topic ,or practicing questions, try to make a note on it , so that the day before exam it is easy to review the points.
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