Final image produced by a compound microscope is_____________? April 17, 2025 by admin A. real and inverted B. real and erect C. virtual and erect D. virtual and inverted
For normal adjustment, length of astronomical telescope is______________? April 17, 2025 by admin 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______________? April 17, 2025 by admin A. zero B. focus C. 2 f D. f/2
Least distance of distinct vision_____________? April 17, 2025 by admin A. increases with increase in age B. decreases with increase in age C. neither increases nor decreases D. becomes infinite after 60 years
Image of an object 5 mm high is only 1 cm high. Magnification produced by lens is__________________? April 17, 2025 by admin A. 0.5 B. 0.2 C. 1 D. 2
A convex lens gives a virtual image only when the objects lies_________________? April 17, 2025 by admin A. between principal focus and center of curvature B. beyond 2 f C. at the principal focus D. between principal focus and optical center
The minimum distance between an object and its real image in a convex lens is_____________? April 17, 2025 by admin A. 2 f B. 2.5 f C. 3f D. 4f
Dioptre power of an concave lens of 10 cm focal length is_______________? April 17, 2025 by admin A. 10 dioptre B. 10 dioptre C. 1 / 10 dioptre D. 1 / 10 dioptre
A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called______________? April 17, 2025 by admin A. center of curvature B. focus C. optical center D. aperture
The value of critical angle for glass is_______________? April 17, 2025 by admin A. 42° B. 47° C. 52° D. 50°
