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Lenses & Mirrors General Knowledge Quiz | Lenses & Mirrors General Knowledge Objective Type Questions & Answers

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Free download in PDF Lenses & Mirrors General Knowledge Objective Type Questions & Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
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(21) What kind of image is formed by a concave lens irrespective of the position of the object?
[A] virtual, upright and diminised
[B] real, upright and diminished
[C] virtual, upright and magnified
[D] real, inverted and magnified
Answer: virtual, upright and diminised
(22) Different objects at different distances are seen by the eye. The parameter that remains constant is
[A] the focal length of the eye lens
[B] the object distance from the eye lens
[C] the radii of culvature of the eye lens
[D] the image distance from the eye lens
Answer: the image distance from the eye lens

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(23) Which of the following is incorrect?
[A] A concave mirror can give a magnified virtual image.
[B] A concave mirror can give a magnified real image.
[C] The virtual image given by a concave mirror is inverted.
[D] The real image given by a concave mirror is inverted.
Answer: The virtual image given by a concave mirror is inverted.
(24) An object is placed at a distance of 12 cm from a convex lens on its principal axis and a virtual image of certain size is formed. If the object is moved further 8 cm away from the lens, a real image of the same size as that of the virtual image is formed . Which one of the following is the focal length of the lens?
[A] 15 cm
[B] 16 cm
[C] 18 cm
[D] 20 cm
Answer: 16 cm

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