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Engineering
2 months, 2 weeks ago
In an experiment a convex lens of focal length
In an experiment a convex lens of focal length 15 cm is placed coaxially on an optical bench in front of a convex mirror at a distance of 5 cm from it. It is found that an object and its image coincide, if the object is placed at a distance of 20 cm from the lens. The focal length of the convex mirror is .
Answers (1)
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safeer
Answered 2 months, 2 weeks ago
Answered 2 months, 2 weeks ago
Given focal length of lents (f) = 1.5 cm
Object distance u = - 20 cm , f = 15 cm
We know that
v = 60 cm
The image 1 gets formed at 60 cm to ghe right of the lens and it will be inverted.
Therefore, Distance between lens and mirror will be
d = image distance(v) - radius of curvature of convex mirror
s = 60 - 2f
2f = 60 - 5
(convex mirror)
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