A diffraction grating is 2.80 cm wide and contains 2700 lines, When used with light of a certain wavelength, a third-order maximum is formed at an angle of 24.0°. What is the wavelength (in nm)? Number i 1.36 Units nm

In a thermally stabilized lab, a Michelson interferometer is used to monitor the temperature to ensure it stays constant. The movable mirror is mounted on the end of a 1.00-m-long aluminum rod, held fixed at the other end. The light source is a He Ne laser, =632.8 nm . The resolution of this apparatus corresponds to the temperature difference when a change of just one fringe is observed. What is this temperature difference?

A beam of 580-nm light passes through two closely spaced glass plates at close to normal incidence as shown in Figure P27.23. For what minimum nonzero value of the plate separation d is the transmitted light bright?

A horizontal laser beam of wavelength 632.8 nm has a circular cross section 2.00 nun in diameter. A rectangular aperture is to lie placed in the center of the beam so that when the light falls perpendicularly on a wall 4.50 m away, the central maximum fills a rectangle 110 mm wide and 6.00 mm high. The dimensions are measured between the minima bracketing the central maximum. Find the required (a) width and (b) height of the aperture. (c) Is the longer dimension of the central bright patch in the diffraction pattern horizontal or vertical? (d) Is the longer dimension of the aperture horizontal or vertical? (e) Explain the relationship between these two rectangles, using a diagram.

On a certain crystal, a first-order X-ray diffraction maximum is observed at an angle of 27.1° relative to its surface, using an X-ray source of unknown wavelength. Additionally, when illuminated with a different known wavelength of 0.137 nm, a second-order maximum is detected at 37.3°. Determine a. the spacing between the reflecting planes.  b. the unknown wavelength.

A particular person's pupil is 4.5 mm in diameter, and the person's normal‑sighted eye is most sensitive at a wavelength of 552 nm. What is angular resolution ?R of the person's eye, in radians?

A diffraction grating is 2.30 cm wide and contains 2100 lines. When used with light of a certain wavelength, a third order maximum is formed at an angle of 21.0 degrees. What is the wavelength (in nm)?

Find the radius of a star image formed on the retina of the eye if the aperture diameter (the pupil) at night is 0.78 cm and the length of the eye is 2.3 cm. Assume the wavelength of starlight in the eye is 500 nm. (1 nm -9 10 m) O a. 2.1E-3 m O b. 1.7E–9 m c. 3.6E–6 m d. 1.8E–6 m O e. 6.4E–7 m

J08

1. The acceptance angle of the cable is?  2. The critical angle for TIR  will be given as? 3. The numerical aperture of the fiber does not depend upon? 4. The refractive index of cladding will be? 5. The numerical aperture of the fiber will be?