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JEE Main Physics Class 12 Ray Optics and Optical Instruments Part 1 Questions
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© examsnet.com
Question : 60
Total: 99
A diver looking up through the water sees the outside world contained in a circular horizon. The refractive index of water is
4
3
,
and the diver's eyes are
15
c
m
below the surface of water. Then the radius of the circle is:
[Online April 9, 2014]
15
×
3
×
√
5
c
m
15
×
3
√
7
c
m
15
×
√
7
3
c
m
15
×
3
√
7
c
m
Validate
Solution:
Given,
µ
=
4
3
h
=
15
c
m
R
=
?
sin
90
°
sin
C
=
µ
⇒
sin
C
=
1
µ
=
R
√
R
2
+
h
2
=
3
4
⇒
16
R
2
=
9
R
2
+
9
h
2
or,
7
R
2
=
9
h
2
or,
R
=
3
√
7
h
=
3
√
7
×
15
c
m
© examsnet.com
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