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12th ICSE
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One end of a cylindrical rod of glass (n = 1.5) shown in the figure is given a spherical shape of the radius

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2.0 cm. On the left side of this end is placed an object O at a distance of 12 cm. Find out the distance (v) of the image.

Important Questions on Refraction of Light at Spherical Surfaces : Lenses

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12th ICSE
IMPORTANT

The radii of curvature of a double convex lens are 15 cm and 30 cm and the refractive index of its glass is 1.5. Calculate the focal length of the lens.

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12th ICSE
IMPORTANT

The radii of curvature of a double concave lens are 30 cm and 60 cm and the refractive index of its glass is 1.5. Calculate the focal length of the lens.

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12th ICSE
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The radius of curvature of each face of a biconcave lens made of glass of refractive index 1.5 is 30 cm. Calculate the focal length of the lens in air.

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12th ICSE
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Calculate the focal length of a convex lens whose radii of curvature of two surfaces is 10 cm and 15 cm respectively and its refractive index is 1.5.

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12th ICSE
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The radius of curvature of the convex face of a plano-convex lens is 55 cm and the refractive index of its material is 1.55. Find the focal length of the lens.

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12th ICSE
IMPORTANT

The radii of curvature of the two faces of a convex lens are 0.10 m and 0.15 m respectively. If the focal length of the lens is 0.12 m, find the refractive index of the material of the lens.

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12th ICSE
IMPORTANT

The radii of curvature of the two surfaces of a convexo-concave lens are 15 cm and 30 cm. Find the focal length of the lens. Take refractive index of the lens material to be 1.5.

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12th ICSE
IMPORTANT

A bi-convex spherical lens A has a focal length of 20 cm. If it is split along a plane AB into two halves to form two plano convex lenses,then what will be the focal length of each plano-convex lens?

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