P1 C1 ANOMALIES OF REFRACTION

Question 1

light will be considered as traveling from

• left to right
• right to left

Answer 1

• left to right

Question 2

if measured in the direction in which light traveling (from left to right), distances are considered ____

• negative
• positive

Answer 2

positive

Question 3

if measured in the direction opposite to that in which light is traveling (from right to left), distances are considered ____

• negative
• positive

Answer 3

negative

Question 4

distances measured above the optic axis are considered

• negative
• positive

Answer 4

positive

Question 5

distances measured below the optic axis are considered

• negative
• positive

Answer 5

negative

Question 6

Indices of refraction

1. aqueous and vitreous
2. cornea
3. lens nucleus
4. lens cortex

Answer 6

1. aqueous and vitreous – 1.336
2. cornea – 1.376
3. lens nucleus – 1.406
4. lens cortex – 1.386

Question 7

Radii of curvature

1. front and back surfaces of the cornea
2. front and back surfaces of the lens

Answer 7

1. front and back surfaces of the cornea
   - - 7.7mm and 6.8mm
2. front and back surfaces of the lens
   - - 10.0mm and 6.0mm

Question 8

focal lengths
which is more longer?
* primary focal length
* secondary focal length

Answer 8

secondary focal length

Question 9

focal lengths
which is shorter longer?
* primary focal length
* secondary focal length

Answer 9

primary focal length

Question 10

corneal thickness

Answer 10

0.5mm