MCQ
An object is placed at a distance u from a simple microscope of focal length f. The angular magnification obtained depends:
- AOn f but not on u.
- BOn u but not on f.
- ✓On f as well as u.
- DNeither on f nor on u.
✓
Answer
Correct option: C.
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 $\text{u}<\text{f},\text{ m}=\frac{\text{D}}{\text{f}}+1$
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 $\text{u}<\text{f},\text{ m}=\frac{\text{D}}{\text{f}}+1$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A wooden object floats in water kept in a beaker. The object is near a side of the beaker. Let $P_1, P_2, P_3$ be the pressures at the three points $A, B$ and $C$ of bottom as shown in the figure.
→The wavelength of $X-$ rays decreases, when
→In a dark room of photography, generally red light is used. The reason is
$\text{AND}$ gate :
→Which one of the following properties of an element is not variable?
The correct symbol for zener diode is
An $EM$ wave propagating in $x$-direction has a wavelength of $8\,mm$. The electric field vibrating $y$ direction has maximum magnitude of $60\,Vm ^{-1}$. Choose the correct equations for electric and magnetic fields if the $EM$ wave is propagating in vacuum
→A glass slab is placed in the path of beam of convergent light. The point of convergence of light:
A beam of light strikes a glass plate at an angle of incident $60^o $ and reflected light is completely polarised than the refractive index of the plate is
→An empty thick conducting shell of inner radius $a$ and outer radius $b$ is shown in figure.If it is observed that the inner face of the shell carries a uniform charge density $-\sigma$ and the surface carries a uniform charge density $ '\sigma '$
→If the outer surface of the shell is earthed, then identify the correct statement(s)