Mathematical concepts 1.2

Question 1

Why are angles important to our eyes?

Answer 1

• as it is possible to have objects of different physical sizes , presented at different distances and yet appear to be the same size when you look at them
• Letters presented at different distances can produce the same image height on the retina
• angles needed to know physical height the object appears to be.
• can change the angle it subtends to our eyes to view physical height of object differently for e.g. on the letter chart, the bigger the letter the larger the angle.

Question 2

All angles?

Answer 2

subtend 5mins of arc