282375 A bi-convex lens made of glass (refractive index 1.5 ) is put in a liquid of refractive index 1.7. Its focal length will be

282376 In a laboratory four convex lenses \(\mathrm{L}_1, \mathrm{~L}_2, \mathrm{~L}_3\), and \(\mathrm{L}_4\) of focal lengths \(2,4,6\) and \(8 \mathrm{~cm}\), respectively are available. Two of these lenses form a telescope of length \(10 \mathrm{~cm}\) and magnifying power 4 . The objective and eye lenses are respectively

282377 A thin convex lens is placed just above an empty vessel of depth \(80 \mathrm{~cm}\). The image of a coin kept at the bottom of the vessel is thus formed \(20 \mathrm{~cm}\) above the lens. If now water is poured in the vessel upto a height of \(64 \mathrm{~cm}\), what will be the approximate new position of the image? Assume that refractive index of water is \(4 / 3\).

282378 The following figure shows a beam of light converging at point \(P\). When a concave lens of focal length \(16 \mathrm{~cm}\) is introduced in the path of the beam at a place shown by dotted line such that OP becomes the axis of the lens, the beam converges at a distance \(x\) from the lens. The value of \(x\) will be eaual to :

282379 An object approaches a convergent lens from the left of the lens with a uniform speed \(5 \mathrm{~m} / \mathrm{s}\) and stops at the focus, the image :

282375 A bi-convex lens made of glass (refractive index 1.5 ) is put in a liquid of refractive index 1.7. Its focal length will be

282376 In a laboratory four convex lenses \(\mathrm{L}_1, \mathrm{~L}_2, \mathrm{~L}_3\), and \(\mathrm{L}_4\) of focal lengths \(2,4,6\) and \(8 \mathrm{~cm}\), respectively are available. Two of these lenses form a telescope of length \(10 \mathrm{~cm}\) and magnifying power 4 . The objective and eye lenses are respectively

282377 A thin convex lens is placed just above an empty vessel of depth \(80 \mathrm{~cm}\). The image of a coin kept at the bottom of the vessel is thus formed \(20 \mathrm{~cm}\) above the lens. If now water is poured in the vessel upto a height of \(64 \mathrm{~cm}\), what will be the approximate new position of the image? Assume that refractive index of water is \(4 / 3\).

282378 The following figure shows a beam of light converging at point \(P\). When a concave lens of focal length \(16 \mathrm{~cm}\) is introduced in the path of the beam at a place shown by dotted line such that OP becomes the axis of the lens, the beam converges at a distance \(x\) from the lens. The value of \(x\) will be eaual to :

282379 An object approaches a convergent lens from the left of the lens with a uniform speed \(5 \mathrm{~m} / \mathrm{s}\) and stops at the focus, the image :

282375 A bi-convex lens made of glass (refractive index 1.5 ) is put in a liquid of refractive index 1.7. Its focal length will be

282376 In a laboratory four convex lenses \(\mathrm{L}_1, \mathrm{~L}_2, \mathrm{~L}_3\), and \(\mathrm{L}_4\) of focal lengths \(2,4,6\) and \(8 \mathrm{~cm}\), respectively are available. Two of these lenses form a telescope of length \(10 \mathrm{~cm}\) and magnifying power 4 . The objective and eye lenses are respectively

282377 A thin convex lens is placed just above an empty vessel of depth \(80 \mathrm{~cm}\). The image of a coin kept at the bottom of the vessel is thus formed \(20 \mathrm{~cm}\) above the lens. If now water is poured in the vessel upto a height of \(64 \mathrm{~cm}\), what will be the approximate new position of the image? Assume that refractive index of water is \(4 / 3\).

282378 The following figure shows a beam of light converging at point \(P\). When a concave lens of focal length \(16 \mathrm{~cm}\) is introduced in the path of the beam at a place shown by dotted line such that OP becomes the axis of the lens, the beam converges at a distance \(x\) from the lens. The value of \(x\) will be eaual to :

282379 An object approaches a convergent lens from the left of the lens with a uniform speed \(5 \mathrm{~m} / \mathrm{s}\) and stops at the focus, the image :

282375 A bi-convex lens made of glass (refractive index 1.5 ) is put in a liquid of refractive index 1.7. Its focal length will be

282376 In a laboratory four convex lenses \(\mathrm{L}_1, \mathrm{~L}_2, \mathrm{~L}_3\), and \(\mathrm{L}_4\) of focal lengths \(2,4,6\) and \(8 \mathrm{~cm}\), respectively are available. Two of these lenses form a telescope of length \(10 \mathrm{~cm}\) and magnifying power 4 . The objective and eye lenses are respectively

282377 A thin convex lens is placed just above an empty vessel of depth \(80 \mathrm{~cm}\). The image of a coin kept at the bottom of the vessel is thus formed \(20 \mathrm{~cm}\) above the lens. If now water is poured in the vessel upto a height of \(64 \mathrm{~cm}\), what will be the approximate new position of the image? Assume that refractive index of water is \(4 / 3\).

282378 The following figure shows a beam of light converging at point \(P\). When a concave lens of focal length \(16 \mathrm{~cm}\) is introduced in the path of the beam at a place shown by dotted line such that OP becomes the axis of the lens, the beam converges at a distance \(x\) from the lens. The value of \(x\) will be eaual to :

282379 An object approaches a convergent lens from the left of the lens with a uniform speed \(5 \mathrm{~m} / \mathrm{s}\) and stops at the focus, the image :

282375 A bi-convex lens made of glass (refractive index 1.5 ) is put in a liquid of refractive index 1.7. Its focal length will be

282376 In a laboratory four convex lenses \(\mathrm{L}_1, \mathrm{~L}_2, \mathrm{~L}_3\), and \(\mathrm{L}_4\) of focal lengths \(2,4,6\) and \(8 \mathrm{~cm}\), respectively are available. Two of these lenses form a telescope of length \(10 \mathrm{~cm}\) and magnifying power 4 . The objective and eye lenses are respectively

282377 A thin convex lens is placed just above an empty vessel of depth \(80 \mathrm{~cm}\). The image of a coin kept at the bottom of the vessel is thus formed \(20 \mathrm{~cm}\) above the lens. If now water is poured in the vessel upto a height of \(64 \mathrm{~cm}\), what will be the approximate new position of the image? Assume that refractive index of water is \(4 / 3\).

282378 The following figure shows a beam of light converging at point \(P\). When a concave lens of focal length \(16 \mathrm{~cm}\) is introduced in the path of the beam at a place shown by dotted line such that OP becomes the axis of the lens, the beam converges at a distance \(x\) from the lens. The value of \(x\) will be eaual to :

282379 An object approaches a convergent lens from the left of the lens with a uniform speed \(5 \mathrm{~m} / \mathrm{s}\) and stops at the focus, the image :