Refraction at curved surfaces
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PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364791 An eye specialist prescribes spectacles having a combination of a convex lens of local length \(40\;cm\) in contact with a concave lens of focal length \(25\;cm\). The power of this lens combination will be

1 \( + 1.5\,D\)
2 \( - 1.5\,D\)
3 \( + 6.67\,D\)
4 \( - 6.67\,D\)
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364792 A thin glass (refractive index 1.5) lens has optical power of\({\rm{ - 5}}\;{\rm{D}}\) in air. Its optical power in a liquid medium with refractive index 1.6 will be

1 \( - 25\;D\)
2 \(25\;D\)
3 \(1\;D\)
4 None of these
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364793 The focal length of a convex lens is \(20\;cm\) and its refractive index is 1.5 . If the radius of curvature of one surface is \(7.5\;cm\), the radius of curvature of the second surface will be

1 \(7.5\;cm\)
2 \(30.0\;cm\)
3 \(75\;cm\)
4 \(5.0\;cm\)
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364794 A focal length of a lens is \(20\;cm\). What is power of a lens in dioptre?

1 \(5\;D\)
2 \(0.1\;D\)
3 \(1\;D\)
4 \(15\;D\)
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PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364791 An eye specialist prescribes spectacles having a combination of a convex lens of local length \(40\;cm\) in contact with a concave lens of focal length \(25\;cm\). The power of this lens combination will be

1 \( + 1.5\,D\)
2 \( - 1.5\,D\)
3 \( + 6.67\,D\)
4 \( - 6.67\,D\)
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364792 A thin glass (refractive index 1.5) lens has optical power of\({\rm{ - 5}}\;{\rm{D}}\) in air. Its optical power in a liquid medium with refractive index 1.6 will be

1 \( - 25\;D\)
2 \(25\;D\)
3 \(1\;D\)
4 None of these
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364793 The focal length of a convex lens is \(20\;cm\) and its refractive index is 1.5 . If the radius of curvature of one surface is \(7.5\;cm\), the radius of curvature of the second surface will be

1 \(7.5\;cm\)
2 \(30.0\;cm\)
3 \(75\;cm\)
4 \(5.0\;cm\)
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364794 A focal length of a lens is \(20\;cm\). What is power of a lens in dioptre?

1 \(5\;D\)
2 \(0.1\;D\)
3 \(1\;D\)
4 \(15\;D\)
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PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364791 An eye specialist prescribes spectacles having a combination of a convex lens of local length \(40\;cm\) in contact with a concave lens of focal length \(25\;cm\). The power of this lens combination will be

1 \( + 1.5\,D\)
2 \( - 1.5\,D\)
3 \( + 6.67\,D\)
4 \( - 6.67\,D\)
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364792 A thin glass (refractive index 1.5) lens has optical power of\({\rm{ - 5}}\;{\rm{D}}\) in air. Its optical power in a liquid medium with refractive index 1.6 will be

1 \( - 25\;D\)
2 \(25\;D\)
3 \(1\;D\)
4 None of these
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364793 The focal length of a convex lens is \(20\;cm\) and its refractive index is 1.5 . If the radius of curvature of one surface is \(7.5\;cm\), the radius of curvature of the second surface will be

1 \(7.5\;cm\)
2 \(30.0\;cm\)
3 \(75\;cm\)
4 \(5.0\;cm\)
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364794 A focal length of a lens is \(20\;cm\). What is power of a lens in dioptre?

1 \(5\;D\)
2 \(0.1\;D\)
3 \(1\;D\)
4 \(15\;D\)
For More Updates join with Us
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364791 An eye specialist prescribes spectacles having a combination of a convex lens of local length \(40\;cm\) in contact with a concave lens of focal length \(25\;cm\). The power of this lens combination will be

1 \( + 1.5\,D\)
2 \( - 1.5\,D\)
3 \( + 6.67\,D\)
4 \( - 6.67\,D\)
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364792 A thin glass (refractive index 1.5) lens has optical power of\({\rm{ - 5}}\;{\rm{D}}\) in air. Its optical power in a liquid medium with refractive index 1.6 will be

1 \( - 25\;D\)
2 \(25\;D\)
3 \(1\;D\)
4 None of these
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364793 The focal length of a convex lens is \(20\;cm\) and its refractive index is 1.5 . If the radius of curvature of one surface is \(7.5\;cm\), the radius of curvature of the second surface will be

1 \(7.5\;cm\)
2 \(30.0\;cm\)
3 \(75\;cm\)
4 \(5.0\;cm\)
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS

364794 A focal length of a lens is \(20\;cm\). What is power of a lens in dioptre?

1 \(5\;D\)
2 \(0.1\;D\)
3 \(1\;D\)
4 \(15\;D\)