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A grating with high resolving power can distinguish _______ difference in wavelengths:

NETNUST Entry TestPhysicsOptical Instruments

Resolving power in mth order diffraction for grating is given by:

NETNUST Entry TestPhysicsOptical Instruments

To see the minor details of the object by microscope, it should have:

NETNUST Entry TestPhysicsOptical Instruments

The focal length of convex lens having magnifying power of 5.55 is:

NETNUST Entry TestPhysicsOptical Instruments

The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:

NETNUST Entry TestPhysicsOptical Instruments

A magnifier gives an image which is:

NETNUST Entry TestPhysicsOptical Instruments

Tick the correct answer:

NETNUST Entry TestPhysicsOptical Instruments

The magnifier forms a virtual image of the object at:

NETNUST Entry TestPhysicsOptical Instruments

The size of the image is maximum when its distance from the magnifying glass is:

NETNUST Entry TestPhysicsOptical Instruments

We know that $M=\frac{\beta}{\alpha}$ for a lens, where $\alpha$ is:

NETNUST Entry TestPhysicsOptical Instruments

The ratio of size of the image to that of object is called:

NETNUST Entry TestPhysicsOptical Instruments

If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of _______ as that of object

NETNUST Entry TestPhysicsOptical Instruments

When the same object is viewed at a shorter distance, the image on the retina of the eye is ______ and so the object appears _____

NETNUST Entry TestPhysicsOptical Instruments

A virtual image is formed when object is placed:

NETNUST Entry TestPhysicsOptical Instruments

For the virtual image, option ______ is not correct

NETNUST Entry TestPhysicsOptical Instruments

Convex lens forms:

NETNUST Entry TestPhysicsOptical Instruments

A ray passing through optical centre of a lens, after refraction:

NETNUST Entry TestPhysicsOptical Instruments

If the object and its image are located at a distance of 5 cm from the focus of a convex lens, the focal length of the lens will be:

NETNUST Entry TestPhysicsOptical Instruments

Conventionally, all the distances p, q, f are measured from _____ of the lens

NETNUST Entry TestPhysicsOptical Instruments

Least distance of distinct vision of an old man possibly becomes:

NETNUST Entry TestPhysicsOptical Instruments

The ratio of the diameters of two convex lenses is ______ the ratio of their focal lengths

NETNUST Entry TestPhysicsOptical Instruments

If the focal length of a convex lens is 5 cm, then to get real and inverted image of the same size as that of object, the object should be placed at:

NETNUST Entry TestPhysicsOptical Instruments

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:

NETNUST Entry TestPhysicsOptical Instruments

If the object is situated at focus of a convex lens, then its image is formed at:

NETNUST Entry TestPhysicsOptical Instruments

When the object lies between F and 2F, the image formed by a convex lens is:

NETNUST Entry TestPhysicsOptical Instruments