A. 2 f
B. 2.5 f
C. 3f
D. 4f
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 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 - 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 - 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 - 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 - When two bodies move toward each other with constant speeds the distance between them decreases at the rate of 6m / sec. If they move in the same direction the distance between them increases at the rate of 4m/sec. Then their speeds are________________?
A. 5m/s, 1m/s
B. 3m/s, 3m/s
C. 6m/s, 1m/s
D. 4m/s, 2m/s - Final image produced by a compound microscope is_____________?
A. real and inverted
B. real and erect
C. virtual and erect
D. virtual and inverted - 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 - 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
