Acknowledgement of Physics. We covered all the Acknowledgement of Physics MCQs in this post for free so that you can practice well for the exam.
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Acknowledgement of Physics Objectives for Students
A lens has a power of +2.0 Dioptre. Which one of the following statements about the lens is true?
(a) The lens is concave and has a focal length of 0.5 m.
(b) The lens is convex and has a focal length of 2.0 m.
(c) The lens is convex and has a focal length of 0.5 m.
(d) The lens is concave and has a focal length of 2.0 m.
Option c – The lens is convex and has a focal length of 0.5 m
If the focal length of a convex lens is 50 cm, then which one of the following is its power?
(a) +2 D
(b) +0.02 D
(c) -0.5 D
(d) +0.5 D
Option a – +2 D
A point on the principal axis of a lens through which light rays pass undeviated is called
(a) First focus
(b) Second focus
(c) Optical center
(d) None of these
Option c – Optical center
An object is placed on the principal axis of a convex lens of a focal length of 10 cm. If the distance of the object from the lens is 30 cm. What is the distance of the image formed?
(a) 20 cm
(b) 15 cm
(c) 30 cm
(d) 10 cm
Option b – 15 cm
When a convex lens produces a real image of an object, the minimum distance between the object and the image is equal to
(a) the focal length of the convex lens.
(b) twice the focal length of the convex lens.
(c) four times the focal length of the convex lens.
(d) one-half of the focal length of the convex lens.
Option c – four times the focal length of the convex lens
The power of a lens is measured in
(a) dioptre
(b) aeon
(c) lumen
(d) candela
Option a – dioptre
Which one of the following statements is not correct?
(a) The radius of curvature of a concave mirror is twice its focal length.
(b) The power of a convex lens is negative and that of a concave lens is positive.
(c) The radius of curvature of a plane mirror is infinity.
(d) When a ray of light passes from an optically denser medium to an optically rarer medium, an angle of refraction is greater than the corresponding angle of incidence.
Option b – The power of a convex lens is negative and that of a concave lens is positive
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