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Eye: A person with myopic eyes has a far point of 15 cm.?
What power contact lenses does she need to correct her version to a standard far point at infinity?
Give your answer in diopter to one decimal point.
2 AnswersPhysics11 months ago
GRIN rod lenses Figure shows graded index rod lenses.?
(a) How would you represent Figure 2.32 (a) using two conventional converging lenses.
What are 0 and O'?
(b) How would you represent Figure 2.32 (b) using a conventional converging lens. What is O'?
(c) Sketch ray paths for a GRIN rod with a pitch between 0.25P and 0.5P starting from 0 at the face center.
Where is O'?
(d) What use is 0.23P GRIN rod lens in Figure 2.32 (c)?
Physics11 months agoCredit-card sized Fresnel lenses are marketed to the aged as a lightweight magnifier that can be carried in a wallet. ?
Estimate the largest visual magnification these achieve.
Physics11 months agoA Boy Scout starts a fire by using a lens from his eyeglasses to focus sunlight on kindling 5.0cm from the lens.?
The Boy Scout has a near point of 15cm
When the lens is used as a simple magnifier,
(a) what is the maximum magnification that can be achieved and
(b) what is the magnification when the eye is relaxed?
1 AnswerPhysics11 months agoDesign an f/10 singlet lens with an EFL of 100 mm for the objective of a Keller man telescope (object at infinity)?
.
Use N-BK7 and a wavelength of 587.6 nm (helium d line). Fix the center thickness at 6 mm and set the stop at the front surface of the lens. Set the semi-diameter of the front and back surfaces to 20 mm. Initial conditions: Use the default radius for the front surface of the lens (R_1 = infinity), calculate the radius of the back surface (R_2) using the thick lens equation, and use the paraxial image distance. Show your calculation for R2, lens data (cut-and-paste from Optic Studio), layout, ray fan and MTF. What is the resolution (Ip/mm) when the MTF is at 50%? What aberration dominates the initial design? Find the best lens shape by manual optimization. First constrain the EFL by setting an Element Power solve ((f) = Iff) on the radius of the back surface of the lens. Next, constrain the image plane by putting a Marginal Ray Height solve on the image distance. Using Excel or MATLAB, plot transverse spherical aberration (TSPH) versus the first-surface curvature (c_1 = 1/R_1) of the lens. Plot TSPH for curvature ranging from -0.04 to 0.06 in increments of 0.02. Aberration data is calculated in the Seidel Coefficients window (Analyze Aberrations Seidel Coefficients, use the total aberration values).Observe how the lens shape changes as you enter new values for R_1. What front - surface radius minimizes spherical aberration?Optimization using Optic Studio:Set the front surface radius and image distance as variables.
Physics11 months agoGiven that the astigmatism ray aberration is first order in the pupil coordinate r?
, what is the functional form (r dependence only) of the associated wavefront error?
Physics11 months agoIf you wear eyeglasses, you know that most glasses correct for defocus?
(too much or too little optical power) and astigmatism. Why is astigmatism corrected and not spherical or coma? What information is on a typical prescription used to correct astigmatism?
Physics11 months ago
You measure astigmatism, via the transverse ray aberration?
, to have a certain worst-cast magnitude Δy at an image point which is located at position which is 1/3 of the total field height. Unfortunately, this is the maximum amount of coma your application can tolerate anywhere in the field. What can you do to fix this problem?
Physics11 months ago
You measure astigmatism, via the transverse ray aberration?
, to have a certain worst-case magnitude Δy at an image point which is located at position which is 1/3 of the total field height. What is the magnitude of the astigmatism at the edge of the field?
Physics11 months agoGiven that the coma ray aberration is second order in the pupil coordinate r, ?
what is the functional form (r dependence only) of the associated wavefront error?
Physics11 months ago
You measure coma, via the transverse ray aberration, to have a certain worst-cast magnitude?
δy at an image point which is located at position which is 1/3 of the total field height. What is the magnitude of the coma at the edge of the field?
Physics11 months agoSpherical aberration belongs to which class of Maxwell’s conditions for perfect imaging?
A)Rays converge to the wrong point in z
B)Rays converge to the wrong point in x & y
C)Rays do not converge to a point.
2 AnswersPhysics11 months agoHow does radiative decay of excited states of isolated atoms happen?
What are the atomic parameters on which radiative transition probability depend on?
2 AnswersPhysics2 years agoA quarter wave transformer is used for matching the transmission line to the load ZL when Z1 is?
1) high
2) low
3) purely resistive
4) complex
2 AnswersEngineering2 years agoA system has poles at 0.01 Hz, 1 Hz and 80Hz, zeroes at 5Hz, 100Hz and 200Hz. The approximate phase of the system response at 20 Hz is :?
a) -90°
b) 0°
c) 90°
d) -180°
1 AnswerEngineering2 years ago
