1. Based on Lau effect in double grating, the focal distance of lens is measured.

2. Nokia : We use a new Active hyper focal distance system for video.

3. From the focal distance formula of thin lens, the convergence and divergence nature of each kind of thin lens are discussed in different media.

4. The size of the illuminated area at the focal distance.

5. The eye that has no focal distance voicelessly opens,(Sentencedict.com) and northern wild strong eyes four eyes are inverse.

6. In this paper, the focal distance formula of lens in varied shapes is obtained by using object methods to make its physical meaning more obvious.

7. But only with the right focal distance and correct aperture could we get the true pictures.

8. Here the focal distance and both eyes parallax are absolute values which was measured by highly efficient sensor in one's eyes.

9. On the basis of their long photomicrographic experience, the authors introduce basic operations, choice of film, regulation of focal distance and exposure, and choice of color filter.

10. This kind of liquid state lens are composed of a pair of waterdrop , they expose under the high frequency sound wave travel between the vibration, changes lens' focal distance along with it.

11. An experimental investigation of the combination of a long focal distance Bragg-Fresnel lens with a bimorph mirror is described.

12. Since the big image is hardly observed in double prism interference experiment, the size of the focal distance is deduced according to the theory.

13. One major problem the researchers had to overcome was the fact that the human eye, with its minimum focal distance of several centimetres(sentencedict.com/focal distance.html), cannot resolve objects on a contact lens.

14. This may avoid remedy mistake because of the actual different focal distance brings from AS function.

15. The picture would become clear lucidity while only adjusting good focal distance, this embodied the strength that the concentration has.

16. The authors have reported two methods for measuring the efficient focal distance of the laser rod lenses.

17. Just as one sees his nose best in a mirror, removed to half the optimum focal distance, so also he best identifies his sense data by reflecting them in external objects.

18. Conjugate method is an accurate, simple and convenient method to measure the focal distance of thin convex lens.

19. A slide lever on the bridge of the eyeglasses pushes the fluid forward or backward to alter the shape of that membrane, changing the focal distance depending on what the user is doing.

20. The major photographic conditions are tube voltage, which relates to the thickness of seed and exposure value, which based on the tube voltage, focal distance and sensitive material.