visiting card appears to be raised by 7 and placed under the rectangular glass sheet placed on office test the refractive index of Glass is 1.5 find the thickness of the glass sheet placed on the office desk
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The shift in position of object due to slab is given by
Δt=t(1−
μ
1
)=3(1−
2
3
1
)=3(1−
3
2
)=1cm
The apparent distance of object from mirror 21−1=20cm
The position of image formed by concave mirror can be found by mirror formula
v
1
+
u
1
=
f
1
...(i)
As object and focus of mirror lies left side of pole of mirror
u=−20,f=−
2
R
=−5
substituting values in equation (i)
v
1
+
−20
1
=
−5
1
v
1
=
20
1
−
20
4
v=−
3
20
As image is other side of the slab,the image will be again shifted by 1 cm away from mirror.
Final distance of image from mirror=
3
20
+1cm=7.67cm
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