Computer Graphics MCQ - Graphics Operations

6 Reflection of a point about x-axis, followed by a counter-clockwise rotation of 90°, is equivalent. to reflection about the line

7 (2,4) is a point on a circle that has centre at the origin. Which of the following point(s) is/are also on the circle?

Since the circle with centre at the origin, is symmetric about the X-axis, Y-axis, the line X = Y and the line X = - Y, the reflection of (2, 4) about these axes, will also be points on the circle.

8 The people of the planet Mars designed a scale for measuring the temperature in which water freezes at 100 units and boils at 250 units. The people of Jupiter designed a scale in which water freezes at 75 units and boils at 300 units. A temperature of 200 units in Mars will measure ___ in Jupiter.

Translating so that both the scales start at the origin, and scaling so that the divisions in both scales coincide, we get the formula (M-100) x 225/150 = J-75, where M refers to the scale in Mars and J, to the scale in Jupiter.
Putting M = 200,
we get J = 225.

9 In Sutherland-Hodgman algorithm for polygon clipping, assume P (present point) lies inside the window and S (previous point) lies outside the window. Then, while processing through that window boundary, we should

10 Assuming that one allows 256 depth value levels to be used, how much memory would a 512 x 512 pixel display require to store the Z-Buffer?

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