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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The energy of a hydrogen atom in its ground state is -13.6eV. The energy of the level corresponding to the quantum number n = 2 (first excited state) in the hydrogen atom is
|
(a) – 2.72 eV |
(b) – 0.85 eV |
(c) – 0.54 eV |
(d) – 3.4 eV |
Two lenses have focal lengths 
and 
and their dispersive powers are 
and 
respectively. They will together form an achromatic combination if
|
(a) |
(b) |
|
(c) |
(d) |
A vertical straight conductor carries a current vertically upwards. A point P lies to the east of it at a small distance and another point Q lies to the west at the same distance. The magnetic field at P is
| (a) Greater than at Q |
| (b) Same as at Q |
| (c) Less than at Q |
| (d) Greater or less than at Q depending upon the strength of the current |
Bohr's atom model assumes
|
(a) The nucleus is of infinite mass and is at rest |
|
(b) Electrons in a quantized orbit will not radiate energy |
|
(c) Mass of electron remains constant |
|
(d) All the above conditions |
