282388 A glass convex lens is of refractive index \(\mathbf{1 . 5 5}\) with both faces of same radius of curvature. What will be the radius of curvature if focal length is to be \(20 \mathrm{~cm}\) ?

282381 A plano-convex lens fits exactly into a planoconcave lens and their plane surfaces are parallel to each other. If \(\mu_1\) and \(\mu_2\) are the refractive indices for plano-convex lens and plano-concave lens respectively and \(R\) is the radius of curvature of the curved surfaces of the lenses, then the focal-length of the combination is

282382 You are given a thin diverging lens of \(20 \mathrm{~cm}\) focal length. Calculate the distance at which an object should be placed to obtain \(1 / 3\) lateral magnification.

282383 A small object is enclosed in a transparent solid sphere of radius \(8 \mathrm{~cm}\). The object is situated at \(2 \mathbf{~ c m}\) from the centre of the sphere. If its image appears to be at \(3.2 \mathrm{~cm}\) from the nearest side, then the refractive index of the material of the sphere is

282388 A glass convex lens is of refractive index \(\mathbf{1 . 5 5}\) with both faces of same radius of curvature. What will be the radius of curvature if focal length is to be \(20 \mathrm{~cm}\) ?

282381 A plano-convex lens fits exactly into a planoconcave lens and their plane surfaces are parallel to each other. If \(\mu_1\) and \(\mu_2\) are the refractive indices for plano-convex lens and plano-concave lens respectively and \(R\) is the radius of curvature of the curved surfaces of the lenses, then the focal-length of the combination is

282382 You are given a thin diverging lens of \(20 \mathrm{~cm}\) focal length. Calculate the distance at which an object should be placed to obtain \(1 / 3\) lateral magnification.

282383 A small object is enclosed in a transparent solid sphere of radius \(8 \mathrm{~cm}\). The object is situated at \(2 \mathbf{~ c m}\) from the centre of the sphere. If its image appears to be at \(3.2 \mathrm{~cm}\) from the nearest side, then the refractive index of the material of the sphere is

282388 A glass convex lens is of refractive index \(\mathbf{1 . 5 5}\) with both faces of same radius of curvature. What will be the radius of curvature if focal length is to be \(20 \mathrm{~cm}\) ?

282381 A plano-convex lens fits exactly into a planoconcave lens and their plane surfaces are parallel to each other. If \(\mu_1\) and \(\mu_2\) are the refractive indices for plano-convex lens and plano-concave lens respectively and \(R\) is the radius of curvature of the curved surfaces of the lenses, then the focal-length of the combination is

282382 You are given a thin diverging lens of \(20 \mathrm{~cm}\) focal length. Calculate the distance at which an object should be placed to obtain \(1 / 3\) lateral magnification.

282383 A small object is enclosed in a transparent solid sphere of radius \(8 \mathrm{~cm}\). The object is situated at \(2 \mathbf{~ c m}\) from the centre of the sphere. If its image appears to be at \(3.2 \mathrm{~cm}\) from the nearest side, then the refractive index of the material of the sphere is

282388 A glass convex lens is of refractive index \(\mathbf{1 . 5 5}\) with both faces of same radius of curvature. What will be the radius of curvature if focal length is to be \(20 \mathrm{~cm}\) ?

282381 A plano-convex lens fits exactly into a planoconcave lens and their plane surfaces are parallel to each other. If \(\mu_1\) and \(\mu_2\) are the refractive indices for plano-convex lens and plano-concave lens respectively and \(R\) is the radius of curvature of the curved surfaces of the lenses, then the focal-length of the combination is

282382 You are given a thin diverging lens of \(20 \mathrm{~cm}\) focal length. Calculate the distance at which an object should be placed to obtain \(1 / 3\) lateral magnification.

282383 A small object is enclosed in a transparent solid sphere of radius \(8 \mathrm{~cm}\). The object is situated at \(2 \mathbf{~ c m}\) from the centre of the sphere. If its image appears to be at \(3.2 \mathrm{~cm}\) from the nearest side, then the refractive index of the material of the sphere is