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______________?

Related Mcqs:

1. 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

2. 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

3. 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

4. In a photoelectric effect monochromatic light is incident on a metal surface. If the incident light of twice the intensity but of same wavelength the kinetic energy of the emitted electron_______________?

   A. Becomes double
   B. Remains same
   C. Becomes half
   D. First increases then decrease because of the curvilinear graph

5. 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

6. 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

7. 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

8. Two sources of light are coherent if they emit rays of_______________?

   A. same wavelength
   B. same amplitude of vibration
   C. same wave length with constant phase difference
   D. same amplitude and wavelength

9. When light incident normally on thin film the path difference depends upon ________________?

   A. thickness of the film only
   B. nature of the film only
   C. angle of indidence only
   D. all thickness nature and angle of incidence

10. Two convex lenses of equal focal length f are placed in contact the resultant focal length of the combination is______________?

    A. zero
    B. focus
    C. 2 f
    D. f/2