Download App

Ray Optics — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsRay Optics1 Mark
MCQ
The magnifying power of a compound microscope increases when
  • A
    The focal length of objective lens is increased and that of eye lens is decreased
  • B
    The focal length of eye lens is increased and that of objective lens is decreased
  • C
    Focal lengths of both objective and eye-piece are increased
  • ✓
    Focal lengths of both objective and eye-piece are decreased
✓

Answer

Correct option: D.
Focal lengths of both objective and eye-piece are decreased
Focal lengths of both objective and eye-piece are decreased

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

Explore more

More "MCQ" from Ray Optics→Ray Optics — all question types→JEE physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

A moving coil galvanometer has $50$ turns and each turn has an area $2 \times 10^{-4} m ^2$. The magnetic field produced by the magnet inside the galvanometer is $0.02 T$. The torsional constant of the suspension wire is $10^{-4} N m rad ^{-1}$. When a current flows through the galvanometer, a full scale deflection occurs if the coil rotates by $0.2$ rad. The resistance of the coil of the galvanometer is $50 \Omega$. This galvanometer is to be converted into an ammeter capable of measuring current in the range $0-1.0 A$. For this purpose, a shunt resistance is to be added in parallel to the galvanometer. The value of this shunt resistance, in ohms, is. . . . . .
→
A small satellite is revolving near earth's surface. Its orbital velocity will be nearly
→
A platinum resistance thermometer has a resistance of $50 \Omega$ at $20^{\circ} \mathrm{C}$. When dipped in a liquid the resistance becomes $76.8 \Omega$. The temperature coefficient of resistance for platinum is $\alpha=3.92 \times 10^{-3} /{ }^{\circ} \mathrm{C}$. The temperature of the liquid is
→
The bob of a simple pendulum (mass $m$ and length $I$ ) dropped from a horizontal position strikes a block of the same mass elastically placed on a horizontal frictionless table. The K.E. of the block will be
→
The current flowing in a copper voltameter is $1.6 A$. The number of $Cu ^{++}$ions deposited at the cathode per minute are
→
When $\vec{A} \cdot \vec{B}=-|A||B|$, then
→
The shortest wavelength in the Lyman series of hydrogen spectrum is $912 \mathring A$ corresponding to a photon energy of $13.6 eV$. The shortest wavelength in the Balmer series is about
→
A car accelerates from rest at a constant rate ${ }_{11} \alpha$ fof some time, after which it decelerates at a constant rate $\beta$ and comes to rest. If the total time elapsed is $t$, then the maximum velocity acquired by the car is
→
When germanium is doped with phosphorus, the doped material has
→
In the circuit diagrams $(A, B, C$ and $D$) shown below, $R$ is a high resistance and $S$ is a resistance of the order of galvanometer resistance $G$. The correct circuit, corresponding to the half deflection method for finding the resistance and figure of merit of the galvanometer, is the circuit labelled as
→