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
Assertion (A): The focal length of a lens does not change when red light is replaced by blue light.
Reason (R): The focal length of a lens depends on the refractive index of material of lens.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true and R is not the correct explanation of A.
- assertion is false but reason is true.
- assertion is true but reason is false.
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?