A source of light is located at double focal length from a convergent lens. The focal length of the lens is $f = 30 c m$ . 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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Solution

An incident light ray passing through focus of a coverging lens becomes parallel to principal axis hence

So mirror should be placed at,
$30 c m + \frac{30}{2} c m = 45 c m$
from light sides of the lens.

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Q. A source of light is located at the double focal length distance 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 such that rays reflected from the mirror become parallel to the principle axis after passing through the lens for second time?

Q. 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)

Q. A point source of light is placed at

2 f

from a converging lens of focal length

f

. A flat mirror is placed on the other side of the lens at a distance d such that rays reflected from the mirror are parallel after passing through the lens again. If

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A converging lens and a diverging mirror are placed at a separation of 15 cm. The focal length of the lens is 25 cm and that of the mirror is 40 cm. Where should a point source be placed between the lens and the mirror so that the light, after getting reflected by the mirror and then getting transmitted by the lens, comes out parallel to the principal axis ?

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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?

An incident light ray passing through focus of a coverging lens becomes parallel to principal axis henceSo mirror should be placed at,30cm+302cm=45cmfrom light sides of the lens.

A source of light is located at double focal length from a convergent lens. The focal length of the lens is $f = 30 c m$ . 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?

An incident light ray passing through focus of a coverging lens becomes parallel to principal axis hence

So mirror should be placed at,
$30 c m + \frac{30}{2} c m = 45 c m$
from light sides of the lens.