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_____________?

Related Mcqs:

Final image produced by a compound microscope is_____________?

A. real and inverted B. real and erect C. virtual and erect D. virtual and inverted...

For normal adjustment, length of astronomical telescope is______________?

A. fo + fe B. fo – fe C. fo / fe D. fe / fo...

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...

Michelson devised the formula to calculate the speed of light_______________?

A. C = 4fd B. C = 8fd C. C = 16fd D. C = 5/2fd...

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...