BIO Entoptic Halos Images produced by structures within the eye (like lens fibers or cell fragments) are referred to as entoptic images These images can sometimes take the form of “halos” around a bright light seen against a dark background. The halo in such a case is actually the bright outer rings of a circular diffraction pattern like Figure 28-29 with the central bright spot not visible because it overlaps the direct image of the light. Find the diameter of the eye structure that causes a circular diffraction pattern with the first dark ring at an angle of 2.7° when viewed with monochromatic light of wavelength 605 nm. (Typical eye structures of this type have diameters on the order of 10 μ m. Also, the index of refraction of the vitreous humor is 1.36.)
BIO Entoptic Halos Images produced by structures within the eye (like lens fibers or cell fragments) are referred to as entoptic images These images can sometimes take the form of “halos” around a bright light seen against a dark background. The halo in such a case is actually the bright outer rings of a circular diffraction pattern like Figure 28-29 with the central bright spot not visible because it overlaps the direct image of the light. Find the diameter of the eye structure that causes a circular diffraction pattern with the first dark ring at an angle of 2.7° when viewed with monochromatic light of wavelength 605 nm. (Typical eye structures of this type have diameters on the order of 10 μ m. Also, the index of refraction of the vitreous humor is 1.36.)
BIO Entoptic Halos Images produced by structures within the eye (like lens fibers or cell fragments) are referred to as entoptic images These images can sometimes take the form of “halos” around a bright light seen against a dark background. The halo in such a case is actually the bright outer rings of a circular diffraction pattern like Figure 28-29 with the central bright spot not visible because it overlaps the direct image of the light. Find the diameter of the eye structure that causes a circular diffraction pattern with the first dark ring at an angle of 2.7° when viewed with monochromatic light of wavelength 605 nm. (Typical eye structures of this type have diameters on the order of 10μm. Also, the index of refraction of the vitreous humor is 1.36.)
A telescope can be used to enlarge the diameter of a laser beam and limit diffraction spreading. The laser beam is sent through the telescope in opposite the normal direction and can then be projected onto a satellite or the Moon. If this is done with the Mount Wilson telescope, producing a 2.54 m diameter beam of 613 nm light, what is the minimum angular spread of the beam?
Neglecting atmospheric effects, what is the size of the spot this beam would make on the Moon, assuming a lunar distance of 3.84×108 m?
The structure molecules can be confirmed by using X-ray diffractionanalysis, which are explained by Bragg’s Law. The law states that when thex-ray is incident onto a crystal surface, its angle of incidence, will reflectback with a same angle of scattering. A first-order reflection from the {111}planes of a cubic crystal was observed at a glancing angle of 18.9° whenCu(Kα) X-rays of wavelength 179 pm were used.
(i) Illustrate clearly the reflection of crystal using Bragg’s Law.(ii) Calculate the unit cell parameters of the crystal.(iii) Calculate the angle at which the same crystal will give a reflectionfrom the {123} planes.
Photography. A wildlife photographer uses a moderate telephoto lens of focal length 135 mm and maximum aperture f/4.00 to photograph a bear that is 11.5 m away. Assume the wavelength is 550 nm. (a) What is the width of the smallest feature on the bear that this lens can resolve if it is opened to its maximum aperture? (b) If, to gain depth of field, the photographer stops the lens down to f/22.0, what would be the width of the smallest resolvable feature on the bear?
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.
Diffraction of light animation best to understand class 12 physics; Author: PTAS: Physics Tomorrow Ambition School;https://www.youtube.com/watch?v=aYkd_xSvaxE;License: Standard YouTube License, CC-BY