MCQ
$A$ microscope is focused on a point object and then its objective is raised through a height of $2cm$. If a glass slab of refractive index $1.5$ is placed over this point object such that it is focused again, the thickness of the glass slab is......$cm$
  • $6$
  • B
    $3$
  • C
    $2$
  • D
    $1.5$

Answer

Correct option: A.
$6$
a

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Give colors of the ring in sequence marked on a resistance of $56 \ k\Omega$ with tolerance $\pm 5\%$
Two bulbs are in parallel and they together consume 48 W from a battery of 6 V. The resistance of each bulb is
When two monochromatic lights of frequency, $v$ and $\frac{v}{2}$ are incident on a photoelectric metal, their stopping potential becomes $\frac{V_{S}}{2}$ and $V_{s}$ respectively. The threshold frequency for this metal is :
In the circuit shown in figure, the $AC$ source gives a voltage $V = 20\, \cos \,(2000t)$. Neglecting source resistance, the voltmeter and ammeter readings will be
$C$ and $Si$ both have same lattice structure ; having $4$ bonding electrons in each. Howeve, $C$ is insulator where as $Si$ is intrinsic semiconductor. This is because
A parallel plate capacitor has circular plates of $10\, cm$ radius separated by an air-gap of $1\, mm$. It is charged by connecting the plates to a $100\, volt$ battery. Then the change in energy stored in the capacitor when the plates are moved to a distance of $1\, cm$ and the plates are maintained in connection with the battery, is
Given below are two statements:

Statement $I$ : The diamagnetic property depends on temperature.

Statement $II$ : The included magnetic dipole moment in a diamagnetic sample is always opposite to the magnetizing field.

In the light of given statement, choose the correct answer from the options given below:

A charge $Q$ is placed at each of the opposite corners of a square. A charge $q$ is placed at each of the other two corners. If the net electrical force on $Q$ is zero, then  $\frac{Q}{q}=$ ______
A steady current flows in a metallic conductor of non-uniform cross-section. The quantity/ quantities constant along the length of the conductor is/are
The electric potential at a distance of $3 \,m$ on the axis of a short dipole of dipole moment $4 \times 10^{-12}$ coulomb-meter is ......... $mV$