Reading Quiz Ch 24 (Optical Instruments)

Reading Question 24.04

The fundamental resolution of a lens or telescope is determined by

the parallax theorem.

the numerical aperture of the lens.

Rayleigh’s criterion.

the lens maker’s principle.

Reading Question 24.07

To focus light to the smallest possible spot, you should choose a lens with

The largest focal length and the smallest diameter.

The smallest focal length and the smallest diameter.

The largest focal length and the largest diameter.

The smallest focal length and the largest diameter.

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Correct

wmin = 2.44λ fD.

Reading Question 24.03

The magnification of a simple magnifier is increased if

the focal length of the lens is increased.

the focal length of the lens is decreased.

the diameter of the lens is increased.

the diameter of the lens is decreased.

Reading Question 24.06

If the near point of your eye is at 75 cm, you are

Nearsighted.

Sharp-sighted.

Farsighted.

Reading Question 24.02

Accommodation of the eye refers to its ability to

rotate in the eye socket to look in different directions.

focus on both nearby and distant objects.

see in both very bright and very dim light.

see both in air and while underwater.

Reading Question 24.01

With what unit is lens power measured?

Biopter

Diopter

Watt

Rayleigh

Reading Question 24.05

If the f-number of a camera lens is doubled, say from F4.0 to F8.0, that means the diameter of the lens

aperture is

Quartered (decreased by a factor of 4).

Doubled (increased by a factor of 2).

Halved (decreased by a factor of 2).

Quadrupled (increased by a factor of 4).

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Correct

The f -number is f/D, and the focal length, f , is fixed.