Download App

Ray Optics and Optical Instruments — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsRay Optics and Optical Instruments1 Mark
Question
A pencil dipped partially in water appears bent because of:
✓

Answer

  1. Refraction at water surface
Explanation:
Refraction is a phenomenon in which a light ray incident on a surface separating two transparent media bends at the change of medium.
Snell's law gives the relation between angle of incidence and refraction and the Refractive index of the respective medium.
$\mu_1$sin(i) = $\mu_2$​sin(r)
where, i, r are the angles of incidence and refraction respectively.

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

Similar questions

The half-life of a sample of a radioactive substance is $1$ hour. If $8\times 10^{10}$ atoms are present at $t = 0,$ then the number of atoms decayed in the duration $t = 2$  hour to $t = 4$ hour will be
→
An electron revolves $6 \times 10^{15}$ times $/ \mathrm{sec}$ in circular loop. The current in the loop is
→
The weight of an empty balloon on a spring balance is $W_1.$ The weight becomes $W_2$ when the balloon is filled with air. Let the weight of the Air itself be $\omega$ neglect the thickness of the balloon when it is filled with air. Also neglect the difference in the densities of air inside and outside the balloon.
→
Two coherent sources of different intensities send waves which interfere. The ratio of maximum intensity to the minimum intensity is 25. The intensities of the sources are in the ratio:
  1. 25 : 1
  2. 5 : 1
  3. 9 : 4
  4. 625 : 1
→
If the current in the circuit for heating the filament is increased, the cutoff wavelength:
→
The length of a solenoid is $0.4m$ and the number turns in it is $500$. A current of $3\ amp$, is flowing in it. In a small coil of radius $0.01m$ and number of turns $10$, a current of $0.4\ amp$. is flowing. The torque necessary to keep the axis of this coil perpendicular to the axis of solenoid will be:
→
The field normal to the plane of a wire of $n$ turns and radius $r$ which carries a current $i$ is measured on the axis of the coil at a small distance $h$ from the centre of the coil. This is smaller than the field at the centre by the fraction
→
The distance moved by a particle in simple harmonic motion in one time period is:
  1. A
  2. 2A
  3. 4A
  4. zero.
→
The de $-$ Broglie wavelength of a photon is twice the de Broglie wavelength of an electron. The speed of the electron is $\text{v}_\text{e}=\frac{\text{c}}{100}$. Then:
→
The law, governing the force acting between two electric charges is known as :
→