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CGPET 2015 Solved Paper
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© examsnet.com
Question : 49
Total: 150
A man who wears glasses of power
3
D
must holds a newspaper at least
25
cm
away to see the print clearly. How far away would the newspaper have to be if he took off the glasses and still wanted clear vision?
10
cm
25
cm
1
m
−
1
m
Validate
Solution:
Given, power P = 3D
f
=
1
P
=
1
3
m
=
100
3
cm
.
u
=
−
25
cm
.
Applying lens formula, we can write
1
v
−
1
u
=
1
f
⇒
1
v
+
1
25
=
3
100
⇒
1
v
=
3
100
=
1
25
=
3
−
4
100
=
−
1
100
v
=
−
100
cm
Now, again using lens formula we can write
1
v
=
1
u
=
1
f
As, focal length of a far sighted person decreases
⇒
1
−
100
−
1
u
>
1
1.7
=
10
17
[
∵
f
<
1.7
cm
]
⇒
1
u
<
−
1
100
−
10
17
=
−
17
−
1000
1700
=
−
1017
1700
⇒
u
>
1700
1000
=
−
1.7
=
−
1
m
(
nearest
option
)
© examsnet.com
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