A. focal length
B. principal axis
C. aperture
D. radius of curvature
Related Mcqs:
- A convex lens of focal length f1 and a concave lens of focal length f2 are placed in contact. The focal length of the combination is_____________?
A. f2 + f1
B. f2 – f1
C. f1f2/f2+f1
D. f1f2/f1-f2 - A convex lens acts as a diverging lens if the_________________?
A. object is beyond C
B. if the object is with in C
C. if the object is within f
D. both B and C - 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 - The power of a concave lens is_______________?
A. real
B. virtual
C. positive
D. negative - 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 - If a convex lens of large aperture fails to converge the light rays incident on it to a single point, it is said to suffer from______________?
A. chromatic aberration
B. spherical aberration
C. both spherical and chromatic
D. distortion - A convex lens gives a virtual image only when the objects lies_________________?
A. between principal focus and center of curvature
B. beyond 2 f
C. at the principal focus
D. between principal focus and optical center - 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 - Dioptre power of an concave lens of 10 cm focal length is_______________?
A. 10 dioptre
B. 10 dioptre
C. 1 / 10 dioptre
D. 1 / 10 dioptre - 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 center
D. aperture
