ABO NOCE Basic Opticianry Ophthalmic Optics Questions and Answers 2

Question 1

A lens has a power of +3.00 D. What is its focal length?

Accepted Answer

33.3 cm

Answer

3.0 cm

Answer

0.33 cm

Answer

300 cm

Question 2

Which of the following best describes the index of refraction?

Accepted Answer

The ratio of the speed of light in a vacuum to the speed of light in a medium

Answer

The angle at which light bends at a surface

Answer

The measure of a lens's vergence power

Answer

The reciprocal of the focal length

Question 3

Snell's Law states that n1 sin θ1 = n2 sin θ2. If light travels from air (n=1.00) into glass (n=1.50) at an angle of incidence of 30°, what is the angle of refraction?

Accepted Answer

19.47°

Answer

45.00°

Answer

30.00°

Answer

48.59°

Question 4

What is the vergence of light at a point 50 cm from a point source?

Accepted Answer

-2.00 D

Answer

+2.00 D

Answer

-0.50 D

Answer

+0.50 D

Question 5

A concave mirror has a radius of curvature of 40 cm. What is its focal length?

Accepted Answer

20 cm

Answer

40 cm

Answer

80 cm

Answer

10 cm

Question 6

Which type of lens corrects myopia (nearsightedness)?

Accepted Answer

Minus (concave) lens

Answer

Plus (convex) lens

Answer

Plano lens

Answer

Prism lens