Physics
For a concave lens, when the object is at a distance equal to the focal length of the lens, the image is formed at :
- optical centre
- second focus
- first focus
- mid point between the optical centre and second focus of the lens
Refraction Lens
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Answer
mid point between the optical centre and second focus of the lens
Reason — For a concave lens, when the object is at a distance equal to the focal length of the lens, the image is formed at mid point between the optical centre and second focus of the lens.
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Related Questions
For a convex lens when the object is at 2F1, then image is formed at :
- F2
- 2F2
- beyond 2F2
- infinity
A concave lens is used in :
- in slide projector
- as magnifying glass
- as burning glass
- in Galilean telescope
A lens forms an inverted image of an object.
(a) Name the kind of lens.
(b) State the nature of the image whether real or virtual?
(a) Name the lens which always forms an erect and virtual image.
(b) State whether the image in part (a) is magnified or diminished?