911. A lens which converges a beam of parallel rays to a point is called
A. Diverging (or concave) lens
B. Converging (or convex) lens
C. Plano concave lens
D. Plano-convex lens

912. A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called
A. Center of curvature
B. Focus
C. Optical centre
D. Aperture

913. The diameter of a lens is called
A. Focal length
B. Principal axis
C. Aperture

914. In going form a denser to rarer medium a ray of light is
A. Deviated
B. Bent away from the normal
C. Bent towards the normal
D. Polarized

915. Unit of the power of a lens is
A. Meter
B. Watt
C. Dioptre
D. Horsepower

916. Dioptre power of a concave lens of 10 cm focal length is
A. 10 dioptre
B. 10 dioptre
C. 1 / 10 dioptre
D. 1 / 10 dioptre

917. The power of a concave lens is
A. Real
B. Virtual
C. Positive
D. Negative

918. The minimum distance between an object and its real image in a convex lens is
A. 2 f
B. 2.5 f
C. 3f
D. 4f

919. If an object is placed away from 2f of a converging lens then the image will be
A. Real and erect
B. Virtual and erect
C. Real and inverted
D. Virtual

920. A convex lens gives a virtual image only when the objects lies
A. Between principal focus and centre of curvature
B. Beyond 2 f
C. At the principal focus
D. Between the principal focus and an optical center

NOTE
IF YOU THINK ANY OF THE MCQ ABOVE IS WRONG.
PLEASE COMMENT WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION IN COMMENT BOX.
THANK YOU