A source of light is placed at double focal length from a convergent lens. The focal length of the lens is f = 30 cm. At what distance from the lens should a flat mirror be placed so that ray reflected from the mirror are parallel after passing through the lens for the second time ?
Text Solution
Verified by ExpertsThe correct answer is:
D
x – f = 2f – x
2x = 3f
x = 1.5f
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