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Lens Formula

A source of l...

Question

A source of light is located from a convergent lens of focal length f=30 cm at a distance double the focal length of the convergent laws. 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. (in cm)

A

10 cm

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B

25 cm

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C

45 cm

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D

60 cm

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Solution

The correct option is C 45 cm

$x = (2 f + 2 f) - \frac{f}{2} = 45 c m$

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