When a glass slab is placed on a cross made on a sheet, the cross appears raised by 1 cm. The thickness of the glass is 3 cm. Then the refractive index of glass is :
32
2
3
3√2
A
3
B
32
C
2
D
3√2
Open in App
Solution
Verified by Toppr
Separation (x) = 1 cm
Thickness (t) = 3 cm
Refractive index is given by the formula,
x=t(1−1μ)
Substituting the values,
1=3(1−1μ)
13=1−1μ
23=1μ
μ=32
The refractive index of the glass slab is 32.
Was this answer helpful?
3
Similar Questions
Q1
When a glass slab is placed on a cross made on a sheet, the cross appears raised by 1 cm. The thickness of the glass is 3 cm. Then the refractive index of glass is :
View Solution
Q2
A dot on a paper appears to be raised by 2cm when viewed normally through a glass slab placed on it. Calculate the thickness of the glass slab if its refractive index is 32.
View Solution
Q3
While finding the refractive index of a glass slab, the travelling microscope is focussed on ink dot on a white paper at position 4.320 cm. When a glass slab is placed on this ink dot on paper, the microscope is raised through 1.80 cm. The thickness of glass slab of refractive index 32 is :
View Solution
Q4
A man places a rectangular glass slab of thickness 9 cm on a newspaper. On the top of the glass slab he places a glass beaker of negligible wall thickness containing water up to a height of 6 cm. If refractive index of glass is 1.5 and refractive index of water is (4/3), what is the apparent depth of the newspaper?
View Solution
Q5
There is a black spot on a table. A glass slab of thickness 6 cm is placed on the table over the spot. Refractive index of glass is 3/2. At what depth from the upper surface will the spot appear when viewed from above?