Question

Thickness of the glass slab)/(Thickness of glass slab - Vertical shift) = _____

Answer 1

Shift due to glass slab =

t[1−

μ

1

]=(6)[1−

3

2

]=(6)[

3

1

]=2 cm

Since radius of curvature =40 cm

Object must be placed on a distance of 42 cm so that due to shift they will be at 40 cm and both coincide.