364816
Focal length of a convex lens is \(20\;cm\) and its RI is 1.5. It produces an erect, enlarged image if the distance of the object from the lens is
1 \(40\;cm\)
2 \(30\;cm\)
3 \(15\;cm\)
4 \(20\;cm\)
Explanation:
A convex lens produces an erect, enlarged image if the object lies between focus and pole i.e., \(\left| u \right| < f\) . Hence,\(\left| u \right| = 15{\mkern 1mu} \;cm\) .
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364817
A convex lens makes a real image \(4\;cm\) long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real image on screen which is \(16 \mathrm{~cm}\) tall. The length of the object must be:
1 \(1/4\;cm\)
2 \(8\;cm\)
3 \(12\;cm\)
4 \(20\;cm\)
Explanation:
According to displacement method \(O=\sqrt{I_{1} I_{2}}\) \(O = \sqrt {4 \times 16} = 8\;cm\).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364818
For a given lens, the magnification was found to be twice as large as when the object was \(0.15\;m\) distant from it as when the distance was \(0.2\;m\) . The focal length of the lens is
364819
A biconvex lens of refractive index 1.5 has a focal length of \(20\,cm\) in air. Its focal length when immersed in a liquid of refractive index 1.6 will be
364820
Statement A : Convergent lens property of converging remains same in any medium. Statement B : Property of lens (diverging or converging) depends on the surrounding medium.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
Explanation:
When a convergent lens is placed inside a transparent medium having refractive index greater than that of material of lens, it behaves as a divergent lens.
364816
Focal length of a convex lens is \(20\;cm\) and its RI is 1.5. It produces an erect, enlarged image if the distance of the object from the lens is
1 \(40\;cm\)
2 \(30\;cm\)
3 \(15\;cm\)
4 \(20\;cm\)
Explanation:
A convex lens produces an erect, enlarged image if the object lies between focus and pole i.e., \(\left| u \right| < f\) . Hence,\(\left| u \right| = 15{\mkern 1mu} \;cm\) .
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364817
A convex lens makes a real image \(4\;cm\) long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real image on screen which is \(16 \mathrm{~cm}\) tall. The length of the object must be:
1 \(1/4\;cm\)
2 \(8\;cm\)
3 \(12\;cm\)
4 \(20\;cm\)
Explanation:
According to displacement method \(O=\sqrt{I_{1} I_{2}}\) \(O = \sqrt {4 \times 16} = 8\;cm\).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364818
For a given lens, the magnification was found to be twice as large as when the object was \(0.15\;m\) distant from it as when the distance was \(0.2\;m\) . The focal length of the lens is
364819
A biconvex lens of refractive index 1.5 has a focal length of \(20\,cm\) in air. Its focal length when immersed in a liquid of refractive index 1.6 will be
364820
Statement A : Convergent lens property of converging remains same in any medium. Statement B : Property of lens (diverging or converging) depends on the surrounding medium.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
Explanation:
When a convergent lens is placed inside a transparent medium having refractive index greater than that of material of lens, it behaves as a divergent lens.
364816
Focal length of a convex lens is \(20\;cm\) and its RI is 1.5. It produces an erect, enlarged image if the distance of the object from the lens is
1 \(40\;cm\)
2 \(30\;cm\)
3 \(15\;cm\)
4 \(20\;cm\)
Explanation:
A convex lens produces an erect, enlarged image if the object lies between focus and pole i.e., \(\left| u \right| < f\) . Hence,\(\left| u \right| = 15{\mkern 1mu} \;cm\) .
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364817
A convex lens makes a real image \(4\;cm\) long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real image on screen which is \(16 \mathrm{~cm}\) tall. The length of the object must be:
1 \(1/4\;cm\)
2 \(8\;cm\)
3 \(12\;cm\)
4 \(20\;cm\)
Explanation:
According to displacement method \(O=\sqrt{I_{1} I_{2}}\) \(O = \sqrt {4 \times 16} = 8\;cm\).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364818
For a given lens, the magnification was found to be twice as large as when the object was \(0.15\;m\) distant from it as when the distance was \(0.2\;m\) . The focal length of the lens is
364819
A biconvex lens of refractive index 1.5 has a focal length of \(20\,cm\) in air. Its focal length when immersed in a liquid of refractive index 1.6 will be
364820
Statement A : Convergent lens property of converging remains same in any medium. Statement B : Property of lens (diverging or converging) depends on the surrounding medium.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
Explanation:
When a convergent lens is placed inside a transparent medium having refractive index greater than that of material of lens, it behaves as a divergent lens.
364816
Focal length of a convex lens is \(20\;cm\) and its RI is 1.5. It produces an erect, enlarged image if the distance of the object from the lens is
1 \(40\;cm\)
2 \(30\;cm\)
3 \(15\;cm\)
4 \(20\;cm\)
Explanation:
A convex lens produces an erect, enlarged image if the object lies between focus and pole i.e., \(\left| u \right| < f\) . Hence,\(\left| u \right| = 15{\mkern 1mu} \;cm\) .
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364817
A convex lens makes a real image \(4\;cm\) long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real image on screen which is \(16 \mathrm{~cm}\) tall. The length of the object must be:
1 \(1/4\;cm\)
2 \(8\;cm\)
3 \(12\;cm\)
4 \(20\;cm\)
Explanation:
According to displacement method \(O=\sqrt{I_{1} I_{2}}\) \(O = \sqrt {4 \times 16} = 8\;cm\).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364818
For a given lens, the magnification was found to be twice as large as when the object was \(0.15\;m\) distant from it as when the distance was \(0.2\;m\) . The focal length of the lens is
364819
A biconvex lens of refractive index 1.5 has a focal length of \(20\,cm\) in air. Its focal length when immersed in a liquid of refractive index 1.6 will be
364820
Statement A : Convergent lens property of converging remains same in any medium. Statement B : Property of lens (diverging or converging) depends on the surrounding medium.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
Explanation:
When a convergent lens is placed inside a transparent medium having refractive index greater than that of material of lens, it behaves as a divergent lens.
364816
Focal length of a convex lens is \(20\;cm\) and its RI is 1.5. It produces an erect, enlarged image if the distance of the object from the lens is
1 \(40\;cm\)
2 \(30\;cm\)
3 \(15\;cm\)
4 \(20\;cm\)
Explanation:
A convex lens produces an erect, enlarged image if the object lies between focus and pole i.e., \(\left| u \right| < f\) . Hence,\(\left| u \right| = 15{\mkern 1mu} \;cm\) .
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364817
A convex lens makes a real image \(4\;cm\) long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real image on screen which is \(16 \mathrm{~cm}\) tall. The length of the object must be:
1 \(1/4\;cm\)
2 \(8\;cm\)
3 \(12\;cm\)
4 \(20\;cm\)
Explanation:
According to displacement method \(O=\sqrt{I_{1} I_{2}}\) \(O = \sqrt {4 \times 16} = 8\;cm\).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364818
For a given lens, the magnification was found to be twice as large as when the object was \(0.15\;m\) distant from it as when the distance was \(0.2\;m\) . The focal length of the lens is
364819
A biconvex lens of refractive index 1.5 has a focal length of \(20\,cm\) in air. Its focal length when immersed in a liquid of refractive index 1.6 will be
364820
Statement A : Convergent lens property of converging remains same in any medium. Statement B : Property of lens (diverging or converging) depends on the surrounding medium.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
Explanation:
When a convergent lens is placed inside a transparent medium having refractive index greater than that of material of lens, it behaves as a divergent lens.
