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When an angle $\alpha$ in a right angled triangle is very small, then approximately:
NET
NUST Entry Test
Physics
Optical Instruments
A lens of 2 cm focal length is to be used as a magnifying glass. Its magnification is:
NET
NUST Entry Test
Physics
Optical Instruments
Magnifying power of a simple microscope is:
NET
NUST Entry Test
Physics
Optical Instruments
Maximum details of an object can be seen by a microscope when the object is illuminated by light of:
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NUST Entry Test
Physics
Optical 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:
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NUST Entry Test
Physics
Optical Instruments
In the formula R=N*m for the diffraction grading, N denotes:
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NUST Entry Test
Physics
Optical Instruments
In the formula $\alpha_{min}=1.22 \frac{\lambda}{D}$, D denotes:
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NUST Entry Test
Physics
Optical Instruments
A grating with high resolving power can distinguish _______ difference in wavelengths:
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NUST Entry Test
Physics
Optical Instruments
Resolving power in mth order diffraction for grating is given by:
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NUST Entry Test
Physics
Optical Instruments
To see the minor details of the object by microscope, it should have:
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NUST Entry Test
Physics
Optical Instruments
The focal length of convex lens having magnifying power of 5.55 is:
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NUST Entry Test
Physics
Optical Instruments
The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:
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NUST Entry Test
Physics
Optical Instruments
A magnifier gives an image which is:
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NUST Entry Test
Physics
Optical Instruments
Tick the correct answer:
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NUST Entry Test
Physics
Optical Instruments
The magnifier forms a virtual image of the object at:
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NUST Entry Test
Physics
Optical Instruments
The size of the image is maximum when its distance from the magnifying glass is:
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NUST Entry Test
Physics
Optical Instruments
We know that $M=\frac{\beta}{\alpha}$ for a lens, where $\alpha$ is:
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NUST Entry Test
Physics
Optical Instruments
The ratio of size of the image to that of object is called:
NET
NUST Entry Test
Physics
Optical 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
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NUST Entry Test
Physics
Optical 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 _____
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NUST Entry Test
Physics
Optical Instruments
A virtual image is formed when object is placed:
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NUST Entry Test
Physics
Optical Instruments
For the virtual image, option ______ is not correct
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NUST Entry Test
Physics
Optical Instruments
Convex lens forms:
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NUST Entry Test
Physics
Optical Instruments
A ray passing through optical centre of a lens, after refraction:
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NUST Entry Test
Physics
Optical 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:
NET
NUST Entry Test
Physics
Optical Instruments
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