OCPP Volume II Questions With Complete
Solutions
critical angle the angle of incidence beyond which rays of light passing through a denser
medium to the surface of a less dense medium are no longer refracted but totally reflected.
3 things that can happen to a ray of light when it passes thro...
critical angle the angle of incidence beyond which rays of light passing through a denser
medium to the surface of a less dense medium are no longer refracted but totally reflected.
3 things that can happen to a ray of light when it passes through a lens absorbed ,
reflected, refracted
monocular PD Pupillary Distance : each eye is measured separately from the center line of
the face. two measurement, two numbers, but mono because its one eye at a time
binocular PD pupillary distance: the measurement is taken from the center puppil to center
pupil. one number, one measurement but it's bino because it encompasses both eyes into one
measurement
eyewear can be divided into what three categories dress, sport and safety
what is transposition changing of a prescription from plus cylinder to minus cylinder or
the other way around. it does not affect the powers of the prescription
, OCPP Volume II Questions With Complete
Solutions
what type of image is formed by a minus lens virtual
a plus lens does what to light rays that pass through it makes them converge
what does the term critical angle of a material mean the ray of light is striking the surface
at an angle so that the ray is refracted along the surface of the lens
a minus lens with the optical center moved up creates base down prism
base up prism projects an image of the object downwards, bends light towards the base,
bends light rays away from the apex
the wavelengths of visible light range approximately from 400-720 nanometers
ROYGBIV (left low frequency)
blue-green the wavelengths that ae the most pleasing to the eye are
, OCPP Volume II Questions With Complete
Solutions
dispersion the breakdown of light into its component colors is called
optical center the point on a lens which a ray of light will pass through without being
deviated . the point of no prism in a lens. in minus lens, it is the point where the two prisms meet
apex to apex, in a plus lens it is the point where the two prisms meet base to base
the lower the abbe number, the more the chromatic aberration
which lens has the characteristic of magnification plus spherical
which lens has the characteristic of thin center / thick edge/ diverging light rays minus
spherical
aspherical front base curve gradually flattens
crown glass index of refraction 1.523 / desity 2.54/ abbe value 59. thinner that cr-39 but
heavier than poly, blocks out aoubt 10% uv
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