The G-Number: A Photometric Lens-Aperture Designation

1965 ◽  
Vol 74 (2) ◽  
pp. 99-101 ◽  
Author(s):  
Allen Stimson
Keyword(s):  
Lens Aperture

Orientational Movements of the Foot of Littorina Species in Relation to the Plane of Vibration of Polarized Light

1961 ◽  
Vol 38 (1) ◽  
pp. 213-224
Author(s):  
G. H. CHARLES
Keyword(s):  
Polarized Light ◽  
Angle Of Incidence ◽  
Virtual Absence ◽  
Lens Aperture ◽  
Light Rays ◽  
Stimulation Of

1. Littorina littoralis (L.), L. saxatilis (L.), L. neritoides (L.) and L. littorea (L.) responded to the plane of vibration (e vector) of polarized light directly incident upon their eyes in the virtual absence of any substrate reflexions. Photonegative winkles orientated parallel with the plane of vibration and photopositive individuals at right angles to this plane. 2. Decrease of the angle of incidence towards zero of polarized light rays incident upon the lens aperture of Littorina littoralis completely destroyed the ability to orientate to the plane of vibration. This can be explained on the basis of a Fresnel reflexion/refraction mechanism of orientation. 3. Unilaterally blinded Littorina littoralis gave just as good an orientation to vertical rays of polarized light as winkles with intact vision. 4. It is concluded that the eyes of Littorina species are capable of detecting the plane of vibration of polarized light directly incident from above by means of a Fresnel reflexion/refraction mechanism, and that orientation does not depend on balanced stimulation of the two eyes.

THE SPECTACLE LENS APERTURE

1944 ◽  
Vol 27 (3) ◽  
pp. 104-115
Author(s):  
JOHN D. SPOONER
Keyword(s):  
Spectacle Lens ◽  
Lens Aperture

Optimum lens aperture in phase-shifting speckle interferometric setups for maximum accuracy of phase measurement

1997 ◽  
Vol 36 (25) ◽  
pp. 6217 ◽  
Author(s):  
Thomas Maack ◽  
Richard Kowarschik ◽  
Gunther Notni
Keyword(s):  
Phase Measurement ◽  
Phase Shifting ◽  
Maximum Accuracy ◽  
Lens Aperture

Performance of a polarization-masked lens aperture in the presence of spherical aberration

2001 ◽  
Vol 4 (1) ◽  
pp. 98-104 ◽  
Author(s):  
D Roy Chowdhury ◽  
K Bhattacharya ◽  
S Sanyal ◽  
A K Chakraborty
Keyword(s):  
Spherical Aberration ◽  
Lens Aperture
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