a convex mirror and a convex lens are held in water
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The focal length of a mirror does not depend upon the nature of the medium in which it is placed whereas the focal length of a lens depends upon the medium in which it is placed. Thus, there will be no change in the focal length of the concave mirror whereas the focal length of the convex lens will change.
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Hi,
Here is answer to your question,
1.
Focal length of any mirror (concave) does not depend on medium, so it remains unchanged. If refractive index of the material of convex lens is greater than that of water, then its focal length will increase. If refractive index of the material of convex lens is equal to that of water, then its focal length will become infinity. If refractive index of the material of convex lens is less than that of water, then its focal length will become negative i.e it will behave like concave lens.
2.
tan_0 has given correct answer. The minimum distance between the object and its real image is 4f, where f is focal length.
Here is answer to your question,
1.
Focal length of any mirror (concave) does not depend on medium, so it remains unchanged. If refractive index of the material of convex lens is greater than that of water, then its focal length will increase. If refractive index of the material of convex lens is equal to that of water, then its focal length will become infinity. If refractive index of the material of convex lens is less than that of water, then its focal length will become negative i.e it will behave like concave lens.
2.
tan_0 has given correct answer. The minimum distance between the object and its real image is 4f, where f is focal length.
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