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Focus of a Concave Lens

83.focal leng...

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83.focal length of an equal convex lens is 20 cm the refractive index of material of the lens is 1.5 now one of the curved surface is silvered at what distance from the lens and object is to be placed so that image coincide with the object

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Q. A plano convex lens of refractive index 1.5 and radius of curvature 30 cm is silvered at the curved surface. Now this lens has been used to from the image of an object. At what distance from this lens an object be placed in order to have a real image of the size of the object :

Q. A plano-convex lens of refractive index

1.5

and radius of curvature

30 c m

is silvered at the curved surface. Now this lens has to be formed to form the image of an object. At what distance from this lens, an object is to be placed in order to have a real image of the size of the object?

One of the surfaces of thin convex lens of focal length 12 cm is silvered and a object is placed at 12 cm in front of lens as shown in figure. If refractive index of lens is 1.5, then distance of image from lens in cm is

Q. A plano – convex lens of refractive index 1.5 and radius of curvature 30cm is silvered at the curved surface. Now this lens is used to form the image of an object. At what distance from this lens, an object be placed in order to have a real image of the size of the object?

Q. A point object is placed in front of an equi- convex lens, of refractive index

1.5

and focal length

20 cm

, at a distance

10 cm

from the lens. If the farther side of the lens from the object is silvered then find the image distance from the lens

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