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level: Level 1 of Prism

Questions and Answers List

level questions: Level 1 of Prism

Question	Answer
It is used to study the reaction of the human eye to light	Prism
It is used to measure eye deviation or to exercise weak extra-ocular muscles	Prism
It is incorporated in eyeglasses to prevent diplopia or straighten deviated yee	Prism
Optical media with two plane and well-polished surfaces which are inclined towards each other	Prisms
It can deflect, deviate, and rotate beams of light as well as dispersing their wavelengths	Prisms
Type of prism that has two triangles as ends and three rectangles as faces	Triangular prism
Type of prism that has four rectangles as faces and two rectangles as ends	Rectangular or cuboid prism
Prisms are used in optics to measure____	phorias and tropias
It acts as beam splitters in photometry and interferometry	Prisms
It is composed of adjacent prisms of increasing power	Prism bars
It is the plane surfaces of a prism which are inclined towards each other	Refracting Surfaces
What part of the prism refers to the planes ABCD and ABEF?	Refracting surfaces
It is the surface facing the object and where incident rays hits the prism	1st refracting surface
The surface where light rays leave the prism	2nd refracting surface
What part of the prism is line AB?	Edge or Apex or Refracting edge
It is the thinnest part of a prism	Edge or Apex or Refracting edge
It is the line of intersections of the two refracting surfaces of a prism	Edge or Apex or Refracting edge
What part of the prism is angle EAC and FBD?	Apical angle or Refracting angle
The two refracting surfaces of prism formed and angle called____	Apical angle or Refracting angle
It is located opposite the apex and considered as the thickest part of a prism	Base
What part of the prism refers to planes AEC and BFD?	Principal section
It is perpendicular to the base and it is the triangular portion of the prism	Principal Section
The ray of light after pass through a prism is bent towards the _____	Base
The image of an object seen through a prism is displaced towards the direction of the ____	Apex
It is the primary usage of the prism	to deviate light
Deviation constant of 1 prism diopter	1cm
Deviation constant of 1 centrad	1cm
Deviation constant of 1 prism degree	0.9cm
Deviation constant of 1 prism degree deviation	1.75cm
A prism with a power of One Prism Diopter can displace a ray of light by 1 cm for every meter distance that the light travels	Prism diopter
It is the most common unit of measurement of prism power	Prism diopter
It is the unit used in clinical practice of a prism	Prism diopter
A prism with a power of One Centrad produces a displacement of light by 1 cm for every meter distance that the light travels on the circumference of a circle	Centrad
It is the less frequently used unit to specify prism power	Centrad
Where is the prism diopter measured?	On a tangent plane !m away
Where is the displacement of a centrad measured?	On the arc of a circle having a 1m radius
A prism with a power of One Prism Degree can displace a ray of light by 0.9 cm for every meter distance that light travels	Prism degree
A prism with a power of One Prism Degree Deviation can displace a ray of light by 1.75 for every meter distance that the light travels	Prism degree deviation
The thin prisms or ophthalmic prisms can be recognized by its____	Apical angle
It has an apical angle of 15 degrees or less	Thins prisms
What is the displacement of the image if the base is oriented downward?	Image Upward
What is the displacement of the image if the base is oriented upward?	Image Downward
What is the displacement of the image if the base is towards the nose?	Image Temporally
What is the displacement of the image if the base is towards the ears?	Image Nasally
The emergent ray formed an angle with the original path of the incident ray and it is called ____	Deviating angle
It is to determine the error of refraction and as the correction to relieve symptoms especially blurring of vision.	Ophthalmic lenses
Darken in sunlight so that you don't need to swap your prescription spectacles for a pair of sunglasses	Photochromic lenses