Lenses & Mirrors General Knowledge Objective Type Questions & Answers

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

View Answer

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

View Answer

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.

View Answer

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

View Answer