MCQ
When the length of a microscope tube increases, its magnifying power
- ✓Decreases
- BIncreases
- CDoes not change
- DMay decrease or increase
✓
Answer
Correct option: A.
Decreases
a
(a) For a microscope $|m|\; = \frac{{{v_o}}}{{{u_o}}} \times \frac{D}{{{u_e}}}$ and $L = {v_o} + {u_e}$
For a given microscope, with increase in $L,$ $u_e$ will increase and hence magnifying power $(m)$ will decrease.
(a) For a microscope $|m|\; = \frac{{{v_o}}}{{{u_o}}} \times \frac{D}{{{u_e}}}$ and $L = {v_o} + {u_e}$
For a given microscope, with increase in $L,$ $u_e$ will increase and hence magnifying power $(m)$ will decrease.
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
As shown, the circuit is made of $8$ different resistors. It is found that when $R_1 = 4\,\,\Omega,$ the resistance between $A$ and $B$ is $2\,\,\Omega.$ Now replace $R_1$ by a $6\,\,\Omega$ resistor, what is the resistance between $A$ and $B$?
→In a potentiometer arrangement, a cell of $emf$ $1.25\,V$ gives a balance point at $35.0\,cm$ length of the wire. If the cell is replaced by another cell and the balance point shifts to $63.0\,cm,$ the $emf$ of the second cell ............... $V$
→Given below are two statements : one is labelled as Assertion $A$ and the other is labelled as Reason $R$
→Assertion $A :$ Photodiodes are preferably operated in reverse bias condition for light intensity measurement.
Reason $R$ : The current in the forward bias is more than the current in the reverse bias for a $p - n$ junction diode.
In the light of the above statement, choose the correct answer from the options given below :
A proton is accelerated through $50,000\, V$. Its energy will increase by
→To obtain $P-$type $Si$ semiconductor, we need to dope pure $Si$ with
→Given below are two statements
→Statement $-I$ : A point charge is brought in an electric field. The value of electric field at a point near to the charge may increase if the charge is positive.
Statement $-II$ : An electric dipole is placed in a non-uniform electric field. The net electric force on the dipole will not be zero.
Choose the correct answer from the options given below
In normal adjustment, for a refracting telescope, the distance between objective and eye piece is $30\,cm$. The focal length of the objective, when the angular magnification of the telescope is $2$ , will be $.....cm$
→If a graph is plotted taking the temperature in Fahrenheit along $Y-$axis and the corresponding temperature in Celsius along the $X-$axis, it will be a straight line
→A satellite of mass $200 \,kg$ revolves around a planet of mass $5 \times 10^{30} \,kg$ in a circular orbit of radius $6.6 \times 10^6 \,m$. Binding energy of the satellite is .............. $J$
→Pressure $Vs$ temperature graph of an ideal gas is shown in figure. Density of the gas at point $A$ is $\rho _0$ , Density at $B$ will be
→