Refraction at curved surfaces
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PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364842 A convex lens is made up of three different material as shown in the figure, for a point object placed on its axis the number of image are:
supporting img

1 1
2 5
3 4
4 3
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364843 An object is placed 50 \(cm\) from a screen as shown in figure.
supporting img

A converging lens is moved such that line \({M N}\) is its principal axis. Sharp images are formed on the screen in two positions of lens separated by 30 \(cm\). Find the focal length of the lens

1 \(4\,cm\)
2 \(8\,cm\)
3 \(10\,cm\)
4 \(5\,cm\)
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364844 A lens is placed between a source of light and a wall. It forms image of area \({{\rm{A}}_1}\) and \({{\rm{A}}_2}\) on the wall for its two different positions. The area of the source or light is

1 \({\left[ {\frac{1}{{{A_1}}} + \frac{1}{{{A_2}}}} \right]^{ - 1}}\)
2 \(\frac{{{A_1} + {A_2}}}{2}\)
3 \({\left[ {\frac{{\sqrt {{A_1}} + \sqrt {{A_2}} }}{2}} \right]^2}\)
4 \(\sqrt {{A_1}{A_2}} \)
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364845 Assertion :
The focal length of an equiconvex lens placed in air is equal to radius of curvature of either face. (Lens is made up of material of refractive index of 1.5.)
Reason :
The focal length will be \(\dfrac{R}{3}\) for equiconvex lens of redfractive index 1.5

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
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PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364842 A convex lens is made up of three different material as shown in the figure, for a point object placed on its axis the number of image are:
supporting img

1 1
2 5
3 4
4 3
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364843 An object is placed 50 \(cm\) from a screen as shown in figure.
supporting img

A converging lens is moved such that line \({M N}\) is its principal axis. Sharp images are formed on the screen in two positions of lens separated by 30 \(cm\). Find the focal length of the lens

1 \(4\,cm\)
2 \(8\,cm\)
3 \(10\,cm\)
4 \(5\,cm\)
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364844 A lens is placed between a source of light and a wall. It forms image of area \({{\rm{A}}_1}\) and \({{\rm{A}}_2}\) on the wall for its two different positions. The area of the source or light is

1 \({\left[ {\frac{1}{{{A_1}}} + \frac{1}{{{A_2}}}} \right]^{ - 1}}\)
2 \(\frac{{{A_1} + {A_2}}}{2}\)
3 \({\left[ {\frac{{\sqrt {{A_1}} + \sqrt {{A_2}} }}{2}} \right]^2}\)
4 \(\sqrt {{A_1}{A_2}} \)
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364845 Assertion :
The focal length of an equiconvex lens placed in air is equal to radius of curvature of either face. (Lens is made up of material of refractive index of 1.5.)
Reason :
The focal length will be \(\dfrac{R}{3}\) for equiconvex lens of redfractive index 1.5

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
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PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364842 A convex lens is made up of three different material as shown in the figure, for a point object placed on its axis the number of image are:
supporting img

1 1
2 5
3 4
4 3
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364843 An object is placed 50 \(cm\) from a screen as shown in figure.
supporting img

A converging lens is moved such that line \({M N}\) is its principal axis. Sharp images are formed on the screen in two positions of lens separated by 30 \(cm\). Find the focal length of the lens

1 \(4\,cm\)
2 \(8\,cm\)
3 \(10\,cm\)
4 \(5\,cm\)
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364844 A lens is placed between a source of light and a wall. It forms image of area \({{\rm{A}}_1}\) and \({{\rm{A}}_2}\) on the wall for its two different positions. The area of the source or light is

1 \({\left[ {\frac{1}{{{A_1}}} + \frac{1}{{{A_2}}}} \right]^{ - 1}}\)
2 \(\frac{{{A_1} + {A_2}}}{2}\)
3 \({\left[ {\frac{{\sqrt {{A_1}} + \sqrt {{A_2}} }}{2}} \right]^2}\)
4 \(\sqrt {{A_1}{A_2}} \)
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364845 Assertion :
The focal length of an equiconvex lens placed in air is equal to radius of curvature of either face. (Lens is made up of material of refractive index of 1.5.)
Reason :
The focal length will be \(\dfrac{R}{3}\) for equiconvex lens of redfractive index 1.5

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
For More Updates join with Us
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364842 A convex lens is made up of three different material as shown in the figure, for a point object placed on its axis the number of image are:
supporting img

1 1
2 5
3 4
4 3
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364843 An object is placed 50 \(cm\) from a screen as shown in figure.
supporting img

A converging lens is moved such that line \({M N}\) is its principal axis. Sharp images are formed on the screen in two positions of lens separated by 30 \(cm\). Find the focal length of the lens

1 \(4\,cm\)
2 \(8\,cm\)
3 \(10\,cm\)
4 \(5\,cm\)
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364844 A lens is placed between a source of light and a wall. It forms image of area \({{\rm{A}}_1}\) and \({{\rm{A}}_2}\) on the wall for its two different positions. The area of the source or light is

1 \({\left[ {\frac{1}{{{A_1}}} + \frac{1}{{{A_2}}}} \right]^{ - 1}}\)
2 \(\frac{{{A_1} + {A_2}}}{2}\)
3 \({\left[ {\frac{{\sqrt {{A_1}} + \sqrt {{A_2}} }}{2}} \right]^2}\)
4 \(\sqrt {{A_1}{A_2}} \)
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364845 Assertion :
The focal length of an equiconvex lens placed in air is equal to radius of curvature of either face. (Lens is made up of material of refractive index of 1.5.)
Reason :
The focal length will be \(\dfrac{R}{3}\) for equiconvex lens of redfractive index 1.5

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
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