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 _____ the displacement of the virtual image

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

White light consists of all colors

• T
• F

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

Angle of deviation for a prism is defined with respect to _______ 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 __ prism diopters

__________ 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