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A source of light is located at double f...

A source of light is located at double focal length from a convergent lens. The focal length of the lens is `f=30cm.` At what distance from the lens should a flat mirror be placed, so that the rays reflected from the mirror are parallel after passing through the lens for the second time?

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To solve the problem, we need to determine the distance from the convergent lens where a flat mirror should be placed so that the rays reflected from the mirror are parallel after passing through the lens for the second time. ### Step-by-Step Solution: 1. **Identify the Focal Length**: The focal length of the lens is given as \( f = 30 \, \text{cm} \). 2. **Determine the Object Distance**: ...
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