Download App

9. Ray optics abd optical instruments — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics9. Ray optics abd optical instruments1 Mark
MCQ
In order to increase the magnifying power of a compound microscope
  • ✓
    The focal lengths of the objective and the eye piece should be small
  • B
    Objective should have small focal length and the eye piece large
  • C
    Both should have large focal lengths
  • D
    The objective should have large focal length and eye piece should have small
✓

Answer

Correct option: A.
The focal lengths of the objective and the eye piece should be small
a
( a)$|m|\; \propto \frac{1}{{{f_o}{f_e}}}$

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 "M.C.Q (1 Marks)" from 9. Ray optics abd optical instruments→9. Ray optics abd optical instruments — all question types→Physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

In the circuit shown below, the cell has an e.m.f. of 10 V and internal resistance of 1 ohm. The other resistances are shown in the figure. The potential difference $V_A-V_B$ is

→
The north pole of a bar magnet is moved swiftly downward towards a closed coil and then second time it is raised upwards slowly. The magnitude and direction of the induced currents in the two cases will be of   

 First case               Second case

→
The current flowing in a coil of self inductance $0.4 \,mH$ is increased by $250 \,mA$ in $0.1\,sec$. The $e.m.f$. induced will be
→
In refraction, light waves are bent on passing from one medium to the second medium, because, in the second medium
→
A simple microscope has:
→
A 100 mH coil carries a current of 1 ampere. Energy stored in its magnetic field is
→
Which of the following did Bohr use to explain his theory?
→
Voltage in the secondary coil of a transformer does not depend upon.
→
Three identical bulbs are connected as shown in figure. When switch $S$ is closed, the power consumed in bulb $B$ is $P$. What will be the power consumed by the same bulb when switch $S$ is opened?
→
The deflection in a moving coil galvanometer is
→