Question

The visible spectrum has wavelength in the range of 400 nm to 700 nm. The angular
spread of the first-order visible spectrum produced by a plane diffraction grating having
6000 lines cm', when the light is incident normal to the grating is
(a) 8.9°
(b) 9.9°
(c) 10.9°
(d) 11.9°
(e) 12.9°​

Answer 1

i thought that the answer is option (d)

hey mate i hope this will help you

Answer 2

Answer:

3. Solve each of the following equations, when 00 << 900.

(a) 3 tan2−1=0 (b) tan 5 = 1