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Can you show the solution and steps 1.) In an experiment involving a diffraction grating where...

Can you show the solution and steps

1.) In an experiment involving a diffraction grating where a screen is place 2 meters behind the grating and light with a wavelength lambda= 6.8x10^(-7) meters is used, the distance from the central bright fringe to the first order bright fringe is y=4.9 cm.

What is the distance between the lines of the diffraction grating in micrometers?

2.) A telescope with a lens diameter of 0.85 m is used to view two planets at the same time.

Assuming light coming from the stars has an average wavelength of 480 nm, what is the approximate minimum angular separation (theta) of the two planets in radians?

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