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MCQs

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The ratio of size of the image to the size of the object is known as
NETNUST Entry TestPhysicsOptical Instruments
The power of a lens is 10 diopters. Its focal length is:
NETNUST Entry TestPhysicsOptical Instruments
How many telephone calls single-mode step Index fiber can carry?
NETNUST Entry TestPhysicsOptical Instruments
In astronomical telescope, which of the following has greater focal length
NETNUST Entry TestPhysicsOptical Instruments
An air bubble in water acts like
NETNUST Entry TestPhysicsOptical Instruments
If a convex lens of focal length F is cut into two identical halves along the lens diameter, the focal length of each half is
NETNUST Entry TestPhysicsOptical Instruments
The magnifying power of telescope is 9 . When it is adjusted for parallel rays, the distance between the objective and eyepiece is 20 cm. The focal lengths of the lenses are
NETNUST Entry TestPhysicsOptical Instruments
Magnification formula for compound microscope is
NETNUST Entry TestPhysicsOptical Instruments
If $f_{o}$ is 25 cm and $f_{e}$ is 5 cm, magnification of Galilean telescope will be
NETNUST Entry TestPhysicsOptical Instruments
Formula of magnification of astronomical telescope is
NETNUST Entry TestPhysicsOptical Instruments
Formula of simple magnification is
NETNUST Entry TestPhysicsOptical Instruments
Spectrometer may be used to find:
NETNUST Entry TestPhysicsOptical Instruments
Important part/s of spectrometer is/are:
NETNUST Entry TestPhysicsOptical Instruments
The focal length of objective lens of microscope is ______ that of eye-piece
NETNUST Entry TestPhysicsOptical Instruments
The magnifying power of a simple microscope can be increased if we use convex lens of:
NETNUST Entry TestPhysicsOptical Instruments
A lens of 5 cm focal length is to be used as a simple microscope. To get the clear image, the object should be placed at:
NETNUST Entry TestPhysicsOptical Instruments
The final image formed by a compound microscope is:
NETNUST Entry TestPhysicsOptical Instruments
A convex lens of focal length 5 cm is to be used as magnifying glass. For the final image to be formed at infinity, the object should be placed at ________ and then its magnification will be:
NETNUST Entry TestPhysicsOptical Instruments
The limit to which a microscope can be used to resolve details of an object, depends upon:
NETNUST Entry TestPhysicsOptical Instruments
In compound microscope, the focal length of the eye-piece and the objective respectively are:
NETNUST Entry TestPhysicsOptical Instruments
When high magnification is required, we should prefer:
NETNUST Entry TestPhysicsOptical Instruments
The working of compound microscope is based on the principle of:
NETNUST Entry TestPhysicsOptical Instruments
In the compound microscope, magnification is produced:
NETNUST Entry TestPhysicsOptical Instruments
The eye-piece of a compound microscope acts as:
NETNUST Entry TestPhysicsOptical Instruments
To mend the watches, the watch-makers make use of:
NETNUST Entry TestPhysicsOptical Instruments
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