A. real
B. virtual
C. positive
D. negative
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 - 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 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 - Unit of power of a lens is________________?
A. meter
B. watt
C. diopter
D. horsepower - Power of a lens is one diopter if its focal length is
A. 1 meter
B. 2 meter
C. ½ meter
D. ¼ meterSubmitted by: Rizwan Ayub Saadi
- 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 spotSubmitted by: Abid Hussain
- 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 diameter of a lens is called________________?
A. focal length
B. principal axis
C. aperture
D. radius of curvature - 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 - 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