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Monochromatic light of wavelenth 655 nm falls on a slit. If the angle between the first bright fringes on either side of the central maximum os 32 degrees, estimate the slit width.

The optics of your visual system have a total refractive power of about +60 D-about +20 D from the lens in your eye and +40 D from the curved shape of your cornea. Surgical procedures to correct vision generally do not work on the lens; they work to reshape the cornea. In the most common procedure, a laser is used to remove tissue from the center of the cornea, reducing its curvature. This change in shape can correct certain kinds of vision problems.
Suppose a man has a far point of 50 cm. How much should the refractive power of her cornea be changed to correct her vision?
A. +1.0 D
B. -1.0 D
C. -2.0 D
D. +2.0 D

When I fly up, I see how my Sun's shadow on Earth is getting bigger but dimmer as the Sun's light is reflected from other objects.
As I flew higher and higher in the direction of the Sun, the Earth got smaller, and eventually, I could cast a shadow on the entire Earth. At this point, no reflection will make my shadow dimmer as I will be covering everything.
However, the closer I get to the Sun, the bigger its angular diameter gets, and I am running into another problem where I am not big enough to cover all its light.
What is the minimum size of an object to cast a shadow on the entire Earth? How far away from Earth should it be?
Assume the Earth is at a distance of 1 AU from the Sun at 0.527 degrees.
Bonus question: Would it be realistic to terraform Venus by temporarily freezing it, by blocking the Sun?

Monochromatic beams are passed on the diffraction grid with a lattice count of 100 lattice/cm of light undergoes dark diffraction to three measured within 5.5 mm of light center, gap distance to the screen 40 cm. What is the wavelength of light used?

Which of following statement regarding non-linear optics is incorrect?
A. Refractive index can depend on light intensity.
B. Two light beams are independent and cannot control each other.
C. It can produce second harmonic generation with light frequency doubled $(2\mathrm{\omega <!--\; \omega \; -->})$
D. It can produce sum-frequency generation of two incident light beams $({\mathrm{\omega <!--\; \omega \; -->}}_3={\mathrm{\omega <!--\; \omega \; -->}}_1+{\mathrm{\omega <!--\; \omega \; -->}}_2)$

In the two-slit interference experiment, how can we determine where a point P on the screen is in the diffraction pattern by giving the maximum or minimum on which it lies or the maximum and minimum between which it lies. Given that the slit widths are each a, their separation is d, the wavelength is $\mathrm{\lambda <!--\; \lambda \; -->}$, the viewing screen is at a distance D and the distance between P and the central maxima is y.
I am not sure if we use the formula $asin\mathrm{\theta <!--\; \theta \; -->}=m\mathrm{\lambda <!--\; \lambda \; -->}$ to calculate m, since I don't know whether this formula can be used in double slit diffraction. Or we should use another method to find out whether P is the maximum/minimum?

Constant width laser beam possible?

What is the spacing between structures in a feather that acts as a reflection grating, given that they produce a first-order maximum for 525-nm light at a ${30.0}^{\circ <!--\; \circ \; -->}$ angle?

What exactly do we mean by 'Free spectral range'?

How is Bragg's Law related to the Phenomenon of Diffraction?

To show that the second and third spectra of grating shone by wavelengths from 400 nm to 700 nm always overlap.

Does light change its color after diffraction? lets have example of red light that is passing through garting, after passing it ,doest it change its color after diffraction?

To focus X rays, such as those collected in the Chandra X–Ray Observatory, it is necessary to use
a. a lens.
b. a concave glass mirror, such as that used in an optical reflecting telescope.
c. a metal dish, such as that used in a radio telescope.
d. grazing incidence optics shaped like a converging, hollow tube.
e. a mesh of conducting wires.

Can a neutron act as a wave? Can the wave of light superpose with the wave of neutrons?

Diffraction gratings with 10,000 lines per centimeter are readily available. Suppose you have one, and you send a beam of white light through it to a screen 2.00 m away.Find the angles for the first-order diffraction of the shortest and longest wavelengths of visible light (380 and 760 nm).

Is light always in this dual state or when it is acting as wave, there is no particle nature and vice versa?

Why did Young use a monochromatic source of light in his experiment?

In a diffraction experiment with waves of wavelength $\mathrm{\lambda <!--\; \lambda \; -->}$, there will be no intensity minima (that is, no dark fringes) if the slit width is small enough. What is the maximum slit width for which this occurs?

What is meant by a 'diffraction-limited value with a focusing objective' and a 'free space propagation value with some divergence $\mathrm{\theta <!--\; \theta \; -->}$'?

Describe about diffraction of light?