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JEE Main 10 Apr 2019 Paper 1 Solved Paper
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© examsnet.com
Question : 11
Total: 90
A ray of light AO in vacuum is incident on a glass slab at angle 60° and refracted at angle 30° along OB as shown in the figure.The optical path length of light ray from A to B is:
2
a
+
2
b
2
√
3
a
+
2
b
2
a
+
2
b
3
2
a
+
2
b
√
3
Validate
Solution:
Optical length = AO + OB
A
90
=
sin
30
°
=
y
2
A
O
=
2
a
b
O
B
=
cos
30
=
√
3
2
⇒
O
B
=
2
b
√
3
∴
O
A
+
O
B
=
2
a
+
2
b
√
3
© examsnet.com
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