The Brewsters angle i_b for an interface should be :

CONCEPT:

Brewster's angle - The Brewster's angle is defined as the angle in which the angle of incidence of the light with a particular polarization is perfectly transmitted through a dielectric surface and there is no reflection and when the unpolarized light is incident on the surface where the light will be reflected on the surface.

CALCULATION:

In the interface of Brewster's angle is written as;

μ = tan i_b ----(1)

here, μ is the refractive index of the given material.

where μ lies between 1 to ∞.

1 < μ < ∞

putting eqaution (1) in the above equation we have;

1 < tan ib < ∞ 

where, ib is the polarization angle.

 tan-1 (1) < ib < tan-1 (∞)

 ⇒ 45° < ib < 90° 

Hence, option (1) is the correct answer.