Practice questions for Module 7

Extra Questions for Module 7
Lens Types and Characteristics. Each worksheet is different, because each one was originally written by a different person. Use the directions at the beginning of each worksheet for that worksheet.

Lens Characteristics Specify P for plus lens, M for minus lens.

Has with motion. __M___
Has plus power. __P___
Has a virtual focus. __M___
Diverges light. __M___
Decreases in power as it moves toward the eye. __P___
Has minus power. __M___
Has a center thicker than the edges. __P___
Has edges thicker than the center. __M___
Minifies. __M___
Has a real focal point. __P___
Decreases in power as it moves away from the eye. __M___
Converges light rays. __P___
Has against motion. __P___
Increases in power as it moves away from the eye. __P___
Magnifies. __P___
Increases in power as it moves toward the eye. __M___

Single Vision Lens Types; Nominal Power formula For each lens, indicate:

if it is a flat or a bent design
whether it is: [indicate all that apply]

biconvex, equiconvex, biconcave, equiconcave, plano-convex, plano-concave, meniscus;
true meniscus, periscopic

what the missing power is [surface or nominal].

flat plano-convex, nominal power +6.00	flat plano-concave nominal power -2.25	flat equiconvex, biconvex nominal power +4.50
bent meniscus, periscopic nominal power +2.75	flat biconcave nominal power -5.00	bent meniscus, periscopic nominal power -0.75
flat biconvex nominal power +3.75	bent meniscus nominal power +1.75	bent meniscus, True Meniscus nominal power +4.00

+3.50 flat biconvex, equiconvex nominal power +7.00	-3.50 flat biconcave nominal power -4.75	+4.00 flat plano-convex nominal power +4.00
-2.00 bent meniscus nominal power +2.00	+4.00 flat biconvex nominal power +5.00	-6.00 bent meniscus, true Meniscus nominal power -4.00
+6.00 bent meniscus, True Meniscus nominal power pl	+4.50 bent meniscus, periscopic nominal power +3.25	-2.00 flat biconcave nominal power -8.00

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