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From the window of his flat in Mumbai, Rohit first looks at a scooter parked on the road below, and then at a bird sitting on a lamp post whose top is at exactly the same height as his window.
Which statement is TRUE?

Class 10Heights and DistancesTrigonometry
  • ABoth objects are seen at the same angle of depression.
  • BThe scooter is seen at an angle of depression greater than 0°, while the bird lies on the horizontal line of sight, so its angle of depression is 0°.
  • CThe bird must be seen at an angle of elevation, because it is sitting on a lamp post.
  • DThe angle of depression of the scooter is measured from the vertical wall of the building.

Step-by-Step Solution

Angles of depression are always measured from the horizontal line through the observer's eye. The bird sits exactly on that horizontal line, so its angle of depression is 0°, while the scooter is below the line and is seen at a positive angle of depression.
Answer: B) The scooter is seen at an angle of depression greater than 0°, while the bird lies on the horizontal line of sight, so its angle of depression is 0°.

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