Optics 1 Exam 3

What is true about prisms?

• refract light and change its direction
• affects the vergence
• surfaces have no dioptric power
• refraction at both surfaces (predict via Snell's Law)
• Virtual image is displaced toward apex of the prism (light ray bends toward base)

The greater the apex angle the (a)   the displacement of the virtual image

When calculating refractions with a prism we assume we are dealing with (a)   light.

White light consists of all colors

• T
• F

Angle of incident and refraction for a prism are defined with respect to (a)  

Angle of deviation for a prism is defined with respect to (a)   of the incident ray

What is prism power?

• quantified in terms of how far light was displaced from the point it would have struck at given distance from prism if not for being bent by the prism
• unit is prism diopter (insert triangle here)
• quantified in terms of apical angle
• quantified in terms of angle of deviation in degrees

A prism that deviates a light ray 1 cm at a distance of one meter has a power of (a)   prism diopters

(a)   is unit of angular measure whose tangent is 0.01 or 1/100

Prism diopters can be expressed by the equation tan d=P/100 (from tand=x/y)

• T
• F