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Image Formation by Convex Lens

The radii of ...

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The radii of curvature of the faces of a double concave lens are 10 cm and 15 cm.If focal length is 12 cm. What is the refractive index of glass?

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Q. If the focal length of a double convex lens is

12 c m

and radii of curvatures of faces are

10 c m

15 c m

respectively, what is the refractive index of the lens?

Q. The radii of curvature of the faees of a double convex lens are 10 cm and 15 cm . Its focal length is 12 cm. What is the refractive index of glass ?

Q. A convexo-concave diverging lens is made of glass of refractive index 1.5 and focal length 24 cm. Radius of curvature for one surface is double that of the other. Then radii of curvature for the two surfaces are (in cm):

Q. The radii of curvature of a double concave lens are

30 c m

60 c m

and the refractive index of its glass is

1.5

. Calculate the focal length of the lens.

Q. A double concave lens is placed in water of refractive index

\frac{4}{3}

. If the radii of curvature of the two surfaces of the lens are 10 cm and 30 cm; and the refractive index of glass is

\frac{3}{2}

, find the focal length of the lens in water.

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