Question

An ink spot is on the sheet of a
paper. A slab of glass of thickness
60 cm and 1.5 refractive index is
placed on the spot. The shifting of
image of the spot will be
i)
iii)
1 cm
1.5 cm
ii)
iv)
2 cm
2.5 cm.
1​

Answer 1

Given:

An ink spot is on the sheet of a paper. A slab of glass of thickness 60 cm and 1.5 refractive index is placed on the spot.

To find:

The shifting of image of the spot will be

Solution:

From given, we have,

Thickness of the glass slab (d) = 60 cm

Refractive Index of the glass slab (μ) = 1.5

We use the formula,

μ = d/d1

1.5 = 60/d1

d1 = 60/1.5

∴ d1 = 40 cm

Now consider,

The shifting of the image of the spot is given by,

h = d - d1

= 60 - 40

= 20 cm.

Hence, the shifting of image of the spot will be 20 cm.