ACOD Workshop 1

The colour of an object is the result of

• Absorption and reflection

• Refraction and transmission

• Reflection and refraction

• Refraction and transmission

When a customer tells us they spend a lot of time fishing and skiing, we should recommend

• 
  

  A graduate tint

• 
  

  A glass lens

• 
  

  A polarising filter

• A high index lens

Refractive index is a measure of

• Lens thickness

• Lens size

• Lens density

• Lens weight

Refraction is

• The bending of light as it passes from one optical medium to another

• Light bouncing off a surface

• Similar to a mirror effect

• The bending of light inside an optical medium

The symbol that represents refractive index is

• D

• Ration

• F

• n

Converging light will

• Eventually make a focal point

• Be very bright

• Never pass through a lens

• Never make a focal point

The lens type needed to correct an astigmatic eye is

• Aspheric

• Double spherical

• Double aspheric

• Plano-cylindrical or sphero-cylindrical

An optical cross represents

• One principal meridian of an astigmatic lens

• The two principal meridians of an astigmatic lens

• Two focal points of an astigmatic lens

• The two principal meridians of a spherical lens

In The Thin Lens Formula, the symbol F₁ stand for

• Total lens power

• Front surface power

• Formula One

• Focal point

Changing the written expression of a prescription from plus cylinder form to minus cylinder form is known as

• Simple transposition

• Prentice’s Rule

• Snell’s Law

• Toric transposition