A converging lens forms a real image I on its optic axis. A rectangular glass slab of refractive index μ and thickness t is introduced between the lens and I. I will move
(a) away from the lens by t(μ - 1)
(b) towards the lens by t(μ - 1)
(c) away from the lens by t(1 - 1/μ)
(d) towards the lens by t(1 - 1/μ)