Prism power Flashcards
1
Q
P=
A
Prison power in prison dioptres (PD)
2
Q
C=
A
Displacement in centimetres (cm)
3
Q
D=
A
Distance from prism in metres (m)
4
Q
Formula to calculate, prism power
A
P = C/D
5
Q
Calculate the prism power for an object that displaces the image 2 cm for an object 25 cm from the prism
A
P = C/D
P= 2cm/0.25m
= 8PD
6
Q
Calculate the prism power for a prism that displaces the image 5cm for an object 2m from the prism?
A
P= C/D
P= 5/2
PD= 2.5
7
Q
What is the amount of image displacement for a 30 PD prism with an object 2m from the prism
A
C= P x D
= 30 x 2
= 60cm
8
Q
What is the amount of image displacement for a 25PD prism with an object 50 cm from the prism
A
C = P x D
= 25 x 0.5
= 12.5 cm
9
Q
At what distance will a 30 PD prism displace an image 10cm?
A
D = C\P
= 10/30
= 0.33m
