A line with positive direction cosines passes through the point and makes equal angles with the coordinate axes. The line meets the plane
at point . The length of the line segment equals
at point . The length of the line segment equals
- (A)1
- (B)
- (C)✓ Correct
- (D)2
Answer: (C)
Solution
Since the line makes equal angles with the coordinate axes and has positive direction cosines, the direction cosines are .
Any point on the line at distance from is:
This point lies on the plane :
Therefore, .
Any point on the line at distance from is:
This point lies on the plane :
Therefore, .
JEE Advanced · 2009 · 12 Apr 2009 · Paper 2 · Single correct option