Question

Two planes are perpendicular to each other. The locus of points at distance d from one of these planes and at distance e from the other is

• A. 2 lines
• B. 4 lines
• C. 2 points
• D. 4 points
• E. 2 planes

Answer 1

The correct option is B 4 lines

If we take two perpendicular planes, then we will get total four region. Now it we consider one region. Then we will get a line which will be a locus of a point which is 'd' distance apart from $p-1$ & 'e' distance apart from $p-2$

This the line which is perpendicular to both planes, along z-axis.

So, similarly we have other ${}^{\prime }{3}^{\prime }$ region also.

So total we will get ${}^{\prime }{4}^{\prime }$ lines

Option 'B'.