Answer:
The ratio,
is 2
Solution:
As per the question:
Wavelength,

Single slit width, w =

Now,
We know from the eqn for diffraction:

Now,
For single slit:
n = 1


For very small angle:
≈

(1)
For double slit:
n = 2
Thus


For very small angle:
≈

(2)
For the ratio,
, we divide en (1) by eqn (2):
