On f as well as u.
Explanation:
The angular magnification is the ratio of the angle subtended by the image to the angle subtended by the object on an unaided eye.
In a simple microscope,
$\text{m}=\frac{\frac{\text{h}}{\text{x}}}{\frac{\text{h}}{\text{D}}}$
Here,
u = Object distance from the lems
D = Image distance form the lens
h = Height of the object
In normal adjustment, the object is placed at a distance equal to focal length (f) from the lens and then magnification is given by m
$=\frac{\text{D}}{\text{f}}$
for $\text{u}<\text{f},\text{ m}=\frac{\text{D}}{\text{f}}+1$
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A molecule with a dipole moment p is placed in an electric field of strength E. Initially the dipole is aligned parallel to the field. If the dipole is to be rotated to be anti-parallel to the field, the work required to be done by an external agency is
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(a) – 2pE |
(b) – pE |
(c) pE |
(d) 2pE |
A radioactive reaction is 
→ 
. How many α and β particles are emitted
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(a) 10α, 6β |
(b) 4 protons, 8 neutrons |
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(c) 6 electrons, 8 protons |
(d) 6β, 8α |
Assertion : Conductors having equal positive charge and volume, must also have same potential.
Reason : Potential depends only on charge and volume of conductor.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
AB and CD are long straight conductor, distance d apart, carrying a current I. The magnetic field at the midpoint of BC is
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(a) |
(b) |
(c) |
(d) |
The band spectra (characteristic of molecular species) is due to emission of radiation
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(a) Gaseous state |
(b) Liquid state |
(c) Solid state |
(d) All of three states |
An electron is moving in the north direction. It experiences a force in vertically upward direction. The magnetic field at the position of the electron is in the direction of
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(a) East |
(b) West |
(c) North |
(d) South |
