Dioptre power of an concave lens of 10 cm focal length is_______________?

Related Mcqs:

1. 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...

2. 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...

3. The power of a concave lens is_______________?

   A. real B. virtual C. positive D. negative...

4. Power of a lens is one diopter if its focal length is

   A. 1 meter B. 2 meter C. ½ meter D. ¼ meter Submitted by: Rizwan Ayub Saadi...

5. 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...

6. Unit of power of a lens is________________?

   A. meter B. watt C. diopter D. horsepower...

7. A person wears spectates with concave lenses. It means that normally (when not using glasses), the image of distant objects is focused in his eyes:

   A. behind the retina B. in front of the retina C. on the retina D. on the blind spot Submitted by: Abid Hussain...

8. 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...

9. 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...

10. 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...