Question

Explain theory of concave grating and explain Eagle's mounting.

Answer 1

Answer:

The theory of the concave grating has been examined in considerable detail by methods of geometrical optics. ... Within certain limitations, it is shown that the aberrations present in an off-plane Eagle mounting may be corrected by a very small rotation of the slit in a plane perpendicular to the optic axis.

hope you get it...

Answer 2

Describe the construction and working of concave grating and discuss Eagle's mountaing