The power of a concave lens 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. 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...

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. Unit of power of a lens is________________?

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

5. 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...

6. 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...

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. The diameter of a lens is called________________?

   A. focal length B. principal axis C. aperture D. radius of curvature...

9. Image of an object 5 mm high is only 1 cm high. Magnification produced by lens is__________________?

   A. 0.5 B. 0.2 C. 1 D. 2...

10. 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...