A person using a lens as a simple microscope sees an ____.
inverted virtual image
inverted real magnified image
upright virtual image
upright real magnified image
Least distance of distinct vision is 25 cm. Magnifying power of simple microscope of focal length 5 cm is ____.
The objective of a compound microscope is essentially ____.
A concave lens of small focal length and small aperture
Convex lens of small focal length and large aperture
Convex lens of large focal length and large aperture
Convex lens of small focal length and small aperture
Resolving power of a microscope depends upon ____.
wavelength of light used, directly
wavelength of light used, inversely
frequency of light used
focal length of objective
In a compound microscope cross-wires are fixed at the point ____.
where the image is formed by the objective
where the image is formed by the eye-piece
where the focal point of the objective lies
where the focal point of the eye-piece lies
In a compound microscope, the focal lengths of two lenses are 1.5 cm and 6.25 cm an object is placed at 2 cm form objective and the final image is formed at 25 cm from eye lens. The distance between the two lenses is ____.
The length of the tube of a microscope is 10 cm. The focal lengths of the objective and eye lenses are 0.5 cm and 1.0 cm. The magnifying power of the microscope is about ____.
In a compound microscope, the intermediate image is ____.
virtual, erect and magnified
real, erect and magnified
real, inverted and magnified
virtual, erect and reduced
The magnifying power of a compound microscope increases when ____.
The focal length of objective lens is increased and that of eye lens is decreased
The focal length of eye lens is increased and that of objective lens is decreased
Focal lengths of both objective and eye-piece are increased
Focal lengths of both objective and eye-piece are decreased