Question 10 of 12intermediate💡 UnderstandShort Answer3 marks

Differentiate between normal and oblique projections

Correct Answer

Normal projection is obtained when the developable surface is tangential to the equator. It is also called the equatorial projection. In this projection, the plane surface touches the globe at the equator.

Oblique projection is obtained when the developable surface is tangential to a point between the pole and the equator. In this case, the plane surface touches the globe at an intermediate point, neither at the equator nor at the pole.

The key difference lies in the position where the developable surface touches the globe—normal projection touches at the equator, while oblique projection touches at any point between the pole and the equator.

Exercise: EXERCISE | Q: 3(iii) | (Page 13)
For More Understanding

Explanation

The textbook clearly distinguishes between normal and oblique projections based on where the developable surface is tangential to the globe. Normal (equatorial) projection touches at the equator, while oblique projection touches at any point between the pole and equator. This is a straightforward differentiation question testing the student's understanding of projection types based on the position of the tangent plane.

Solution Steps

  1. Step 1: Identify the definition of normal projection from the context - tangential to the equator

  2. Step 2: Identify the definition of oblique projection from the context - tangential to a point between pole and equator

  3. Step 3: Compare and highlight the key difference in the position of tangency

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