Download App

Ray Optics — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsRay Optics1 Mark
MCQ
Shown in the figure here is a convergent lens placed inside a cell filled with a liquid. The lens has focal length $+ 20 \ cm$ when in air and its material has refractive index $1.50.$ If the liquid has refractive index $1.60,$ the focal length of the system is
  • A
    $+ 80 \ cm$
  • B
    $– 80 \ cm$
  • C
    $– 24 \ cm$
  • ✓
    $–100 \ cm$
✓

Answer

Correct option: D.
$–100 \ cm$
$–100 \ cm$

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 Ray Optics→Ray Optics — all question types→Physics STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

To generate a power of $3.2$ mega watt, the number of fissions of $\mathrm{U}^{235}$ per minute is $($Energy released per fission $= 200\ \text{MeV}, 1eV = 1.6 \times 10^{-19} J)$ 
→
An a particle is accelerated through a $p.d$ of $10^6$ volt then $K.E.$ of particle will be
→
The ratio of amplitude of a magnetic field to the amplitude of electric field for an electromagnetic wave propagating in vacuum is equal to:
→
In forward bias, the width of potential barrier in a P-N junction diode(a) Increases(b) Decreases(c) Remains constant(d) First increases then decreases
   
   
→
A semiconductor is a material with a small but non-zero band gap that behaves as an insulator at absolute zero but allows thermal excitation of electrons into its ____________ at temperatures that are below its melting point.
→
An electromognetic wave travels in vacuum along z direction: $\text{E}=\big(\text{E}_1\hat{\text{i}}+\text{E}_2\hat{\text{j}}\big)\cos(\text{kz}-\omega\text{t})$. Choose the correct options from the following:
→
Main source of electromagnetic waves is:
→
A radioactive sample is $a-$emitter with half life $138.6$ days is observed by a student to have $2000$ disintegration$/\sec$. The number of radioactive nuclei for given activity are
→
In the given figure, when key $K$ is opened, the reading of the ammeter $A$ will be
→
Wavefront of a wave has direction with wave motion(a) Parallel(b) Perpendicular(c) Opposite(d) At an angle of ?
       
→