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When an angle $\alpha$ in a right angled triangle is very small, then approximately:

NETNUST Entry TestPhysicsOptical Instruments

A lens of 2 cm focal length is to be used as a magnifying glass. Its magnification is:

NETNUST Entry TestPhysicsOptical Instruments

Magnifying power of a simple microscope is:

NETNUST Entry TestPhysicsOptical Instruments

Maximum details of an object can be seen by a microscope when the object is illuminated by light of:

NETNUST Entry TestPhysicsOptical Instruments

Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be:

NETNUST Entry TestPhysicsOptical Instruments

In the formula R=N*m for the diffraction grading, N denotes:

NETNUST Entry TestPhysicsOptical Instruments

In the formula $\alpha_{min}=1.22 \frac{\lambda}{D}$, D denotes:

NETNUST Entry TestPhysicsOptical Instruments

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