Question

two beams l1 and l2 are leaning on opposite sides of a thin vertical wall meeting at the same point on the wall and making angles 30degree and 60degree with it respectively. then l2 is equal to
A) l1/2 B)2l1 C) l1sqrt{2} D)l1sqrt(3)

Answer 1

then l2 is equal to A)l1/2