η

Magnifying Glass

Fresnel Corrector

Eyepiece’s length/m

Diameter/m

F-number

p

F-number

Rim feature size/μm

0.005

25

100

1

0.5

1

<1.2

0.01

25

100

1

1

2

<3.3

0.02

25

100

1

2

4

<9