2 The primary mirror of the orbiting telescope has a diameter of 6.7 cm being in orbit, this telescope avoids the degrading effects of atmospheric distortion on its resolution. Assuming an average light wavelength of 400 nm, what is the angle between two just-resolvable point light sources? A) 4.02 x 10 rad B) 5.24 x 10 rad C) 6.44 x 10 rad D) 7.28 x 10 rad E 8.03 x 10 ad

2) Light from glowing hydrogen contains many discrete spectral lines, of which two are Ha (hydrogen-alpha) and HB (hydrogen-beta), with wavelengths of 656.3 nm and 486.1 nm, respectively. Find the first-order angular separation between these wavelengths in a spectrometer that uses a grating with 6000 slits per cm.

3. A particular diffraction grating has 1 300 grooves per millimeter, and 15.0 mm of illuminated area. a) Assuming an incident angle of 45.0°, calculate the diffraction angle for first-order light at 625 nm. b) What wavelength of light would give this same diffraction angle in the second order? )What is the first-order resolving power of the grating? d) What must be the separation (in nm) of two first-order spectral lines centered at 625 nm if they are to be resolved? e) What is the angular dispersion (in degrees) between the two lines in part (d) asthey emerge from the grating?