# OpenOptix ABO Review Questions

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Chapter 2: BASIC OPTICAL PRINCIPLES OpenOptix; ABO Study Guide Review Questions; Ver. 1.3

### The speed of light is: a. 160,000 meters / second b. 186,000 meters / second c. 169,000 miles / hour d. 186,000 miles / second

186,000 miles / second

Red

### In a minus powered lens light rays ____ and come to a focal point ____ the lens. a. Converge, behind b. Converge, in front of c. Diverge, in front of d. Diverge, behind

Diverge, in front of

2.00 D

### 1 Prism Diopter can be described as deviating a ray of light: a. 1 meter / 1 centimeter b. 10 centimeters / 1000 centimeters c. 1 millimeter / 1 meter d. 1 meter / 1 millimeter

10 centimeters / 1000 centimeters

3 @ 000º

2.5 mm

Air

Refraction

+50 cm

2.4 base up

### One prism diopter _______ . a. Focuses parallel light rays at 40 cm b. Deviates a ray of light 1 cm at a distance of one meter c. Deviates a ray of light towards the apex d. Focuses parallel rays of light at one meter

Deviates a ray of light 1 cm at a distance of one meter

### One of the ways of identifying a lens with minus power is to look for: a. Parallel rays of light coming to a point focus behind lens b. Lens thicker in the center than the edge c. Objects seen through the lens are brighter d. Objects seen through the lens seem to move in the same direction as the lens is moving

Objects seen through the lens seem to move in the same direction as the lens is moving

### The focal length of a lens may be altered by: a. Making the lens smaller b. Making the lens larger c. Changing the curvature of one surface d. Coating the surface to prevent reflections

Changing the curvature of one surface

1.00

### The P.D. written on the order is mistakenly noted as 70 mm, when the actual measurement should be 66 mm. What unwanted prism would be found in the prescription if the distance prescription is O.U. -15.00D sphere? a. 3ΔD base in each eye b. 3ΔD base out each eye c. 2ΔD base in each eye d. 2ΔD base out each eye

3ΔD base in each eye

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