Help Needed With Smc Course ... Angles Into Prism Dioptres!

[leeberbillion]

Any help would be greatful!

Having trouble with angles with 30' by it ...

e.g

convert this angle into a prism dioptre

2 degrees 30'

How do you do it? i thought it was tan 2.30 then times 100 ...

Any help?

Many thanks lee x

[Comma]

You need the prism index also

prism dioptre = 100 tan ((n-1) A)

And 30' is 0.50, not 0.30
put it in decimal.

Hope this helps

[HarryChiling]

Comma's got it right, 30' stands for 30 minutes and just like an hour contains 60 minutes a degree contains 60 minutes, so 30' would be half a degree or 0.50.