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A mirror 30 mm X 40 mm is inclined to the wall such that its front view is a square of 30mm side. The longer side of the mirror appear perpendicular to both HP and VP. Find the inclination of the mirror with the wall.

(a) 48.76^o

(b) 36.78^o

(c) 51.76^o

(d) 41.41^o

The question was posed to me in quiz.

I need to ask this question from Projections of Planes topic in chapter Orthographic Projection, Projections of Lines, Planes and Solids of Civil Engineering Drawing

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The correct option is (d) 41.41^o

The best I can explain: Referring the figure below, on measuring the value of φ, inclination is known.

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