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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?
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In astronomical telescope, which of the following has greater focal length
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An air bubble in water acts like
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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
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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
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Magnification formula for compound microscope is
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If $f_{o}$ is 25 cm and $f_{e}$ is 5 cm, magnification of Galilean telescope will be
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Formula of magnification of astronomical telescope is
NETNUST Entry TestPhysicsOptical Instruments
Formula of simple magnification is
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Spectrometer may be used to find:
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Important part/s of spectrometer is/are:
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The focal length of objective lens of microscope is ______ that of eye-piece
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The magnifying power of a simple microscope can be increased if we use convex lens of:
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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:
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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:
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The eye-piece of a compound microscope acts as:
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To mend the watches, the watch-makers make use of:
NETNUST Entry TestPhysicsOptical Instruments