364723
An object is placed at the principal focus of a convex mirror. The image will be at
1 Centre of curvature
2 Principal focus
3 Infinity
4 No image will be formed
Explanation:
No image is formed when an object is placed at the principle focus of a convex mirror as the object is behind the reflecting surface.
KCET - 2018
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364724
For a point object, which of the following always produces virtual image in air?
1 Convex mirror
2 Biconvex lens
3 Concave mirror
4 Plano-convex lens
Explanation:
Convex mirror always produces virtual image in air. Correct option is (1).
KECT - 2023
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364725
An object \(3\;cm\) tall is placed on the principle axis of a concave mirror of focal length \(9\;cm\) at a distance of \(12\;cm\) from it. What is the nature and size of the image?
364726
Assertion : The mirrors used in search lights are parabolic and not concave spherical. Reason : In a concave spherical mirror the image formed is always virtual.
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.
Explanation:
Search lights require a highly concentrated, parallel beam of light. When a source is positioned at the focus of a concave spherical mirror, only the paraxial rays become parallel. If there is the large aperture of the mirror, the marginal rays result in a divergent beam. In contrast, with a parabolic mirror, when the source is located at the focus, the entire cross-section of the mirror produces a parallel beam of light. So correct option is (3).
364723
An object is placed at the principal focus of a convex mirror. The image will be at
1 Centre of curvature
2 Principal focus
3 Infinity
4 No image will be formed
Explanation:
No image is formed when an object is placed at the principle focus of a convex mirror as the object is behind the reflecting surface.
KCET - 2018
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364724
For a point object, which of the following always produces virtual image in air?
1 Convex mirror
2 Biconvex lens
3 Concave mirror
4 Plano-convex lens
Explanation:
Convex mirror always produces virtual image in air. Correct option is (1).
KECT - 2023
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364725
An object \(3\;cm\) tall is placed on the principle axis of a concave mirror of focal length \(9\;cm\) at a distance of \(12\;cm\) from it. What is the nature and size of the image?
364726
Assertion : The mirrors used in search lights are parabolic and not concave spherical. Reason : In a concave spherical mirror the image formed is always virtual.
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.
Explanation:
Search lights require a highly concentrated, parallel beam of light. When a source is positioned at the focus of a concave spherical mirror, only the paraxial rays become parallel. If there is the large aperture of the mirror, the marginal rays result in a divergent beam. In contrast, with a parabolic mirror, when the source is located at the focus, the entire cross-section of the mirror produces a parallel beam of light. So correct option is (3).
364723
An object is placed at the principal focus of a convex mirror. The image will be at
1 Centre of curvature
2 Principal focus
3 Infinity
4 No image will be formed
Explanation:
No image is formed when an object is placed at the principle focus of a convex mirror as the object is behind the reflecting surface.
KCET - 2018
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364724
For a point object, which of the following always produces virtual image in air?
1 Convex mirror
2 Biconvex lens
3 Concave mirror
4 Plano-convex lens
Explanation:
Convex mirror always produces virtual image in air. Correct option is (1).
KECT - 2023
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364725
An object \(3\;cm\) tall is placed on the principle axis of a concave mirror of focal length \(9\;cm\) at a distance of \(12\;cm\) from it. What is the nature and size of the image?
364726
Assertion : The mirrors used in search lights are parabolic and not concave spherical. Reason : In a concave spherical mirror the image formed is always virtual.
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.
Explanation:
Search lights require a highly concentrated, parallel beam of light. When a source is positioned at the focus of a concave spherical mirror, only the paraxial rays become parallel. If there is the large aperture of the mirror, the marginal rays result in a divergent beam. In contrast, with a parabolic mirror, when the source is located at the focus, the entire cross-section of the mirror produces a parallel beam of light. So correct option is (3).
364723
An object is placed at the principal focus of a convex mirror. The image will be at
1 Centre of curvature
2 Principal focus
3 Infinity
4 No image will be formed
Explanation:
No image is formed when an object is placed at the principle focus of a convex mirror as the object is behind the reflecting surface.
KCET - 2018
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364724
For a point object, which of the following always produces virtual image in air?
1 Convex mirror
2 Biconvex lens
3 Concave mirror
4 Plano-convex lens
Explanation:
Convex mirror always produces virtual image in air. Correct option is (1).
KECT - 2023
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364725
An object \(3\;cm\) tall is placed on the principle axis of a concave mirror of focal length \(9\;cm\) at a distance of \(12\;cm\) from it. What is the nature and size of the image?
364726
Assertion : The mirrors used in search lights are parabolic and not concave spherical. Reason : In a concave spherical mirror the image formed is always virtual.
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.
Explanation:
Search lights require a highly concentrated, parallel beam of light. When a source is positioned at the focus of a concave spherical mirror, only the paraxial rays become parallel. If there is the large aperture of the mirror, the marginal rays result in a divergent beam. In contrast, with a parabolic mirror, when the source is located at the focus, the entire cross-section of the mirror produces a parallel beam of light. So correct option is (3).
