Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Physics
Physics
Problem
A ray of light travelling in the direction
1
2
(
i
^
+
3
j
^
)
\frac{1}{2}(\hat{i} + \sqrt{3}\hat{j})
2
1
(
i
^
+
3
j
^
)
is incident on a plane mirror. After reflection, it travels along the direction
1
2
(
i
^
−
3
j
^
)
\frac{1}{2}(\hat{i} - \sqrt{3}\hat{j})
2
1
(
i
^
−
3
j
^
)
. The angle of incidence is a.
30
∘
30^\circ
3
0
∘
b.
45
∘
45^\circ
4
5
∘
c.
60
∘
60^\circ
6
0
∘
d.
75
∘
75^\circ
7
5
∘
Browse the problem library