Physics
A ray of light parallel to the principal axis for a concave lens after refraction :
- passes through the second focus
- passes through the first focus
- appears to pass through the second focus
- appears to come from the second focus
Refraction Lens
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Answer
appears to come from the second focus
Reason — For a concave lens, the second focal point is a point F2 on the principal axis of the lens such that the rays of light incident parallel to the principal axis, after refraction from the lens, appear to be diverging from this point.
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Related Questions
In figure (a) and (b), F1 and F2 are the positions of the two foci of thin lenses. Draw the path taken by the light ray AB after it emerges from each lens.
(a) Figure a
(b) Figure b
In figure (a) and (b), F1 and F2 are the two foci of thin lenses and AB is the incident ray. Complete the diagram to show the path of the ray AB after refraction through the lens.
(a) Figure a
(b) Figure b
Which of the ray diagrams are correct ?
1.
2.
3.
4.
Identify the incorrect statement :
- A real image is formed due to actual intersection of the rays refracted by the lens.
- A virtual image can be obtained on the screen.
- A virtual image is erect with respect to the object.
- A real image is inverted with respect to the object.