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CGP EDU Academic Team
Published on: August 13, 2026
The diameter of a parabolic reflector is 12cm and its depth is 4cm. The position where the bulb on the axis is to be placed at a distance from vertex is equal to
Text Solution
Verified by ExpertsThe correct answer is:
D
From the diagram (4, 6) is point on y 2 = 4ax
⇒ ⇒ a = 2.25
By the reflection property of parabola, any ray incident on the parabolic mirror which is parallel to the axis will reflect through the focus.
∴ ∴ The position where the bulb placed = The position of the focus.
∴ ∴ Required distance = a = 2.25
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