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

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Questions
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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