Download App

Wave Optics — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsWave Optics1 Mark
Question
A very thin film in reflected white light appears:
✓

Answer

  1. black
Explanation:
For very thin films the distance travelled inside the film is insignificant and so the two reflected waves are almost exactly out of phase with each other (due to the phase change at one surface); they interfere destructively and the film appears 'black'.

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

Similar questions

An electron of charge ‘e’ coulomb passes through a potential difference of V  volts. Its energy in ‘joules’ will be(a) V/e (b) eV(c) e/V (d) V
       
→
Two electric bulbs rated $\mathrm{P}_1$ watt $V$ volts and $\mathrm{P}_2$ watt $V$ volts are connected in parallel and $V$ volts are applied to it. The total power will be
→
The drift velocity does not depend upon(a) Cross-section of the wire(b) Length of the wire(c) Number of free electrons(d) Magnitude of the current
   
   
→
A cork floating in a calm pond executes simple harmonic motion of frequency v when a wave generated by a boat passes by it. The frequency of the wave is:
  1. $\text{v}$
  2. $\frac{\text{v}}{2}$
  3. $2\text{v}$
  4. $\sqrt{2}\text{v}.$
→
A p-n junction diode cannot be used:
→
The ratio of the energies of the hydrogen atom in its first to second excited states is:
→
Two different coils have self-inductance $L_1=8\ mH, L_2=2\ mH.$ The current in one coil is increased at a constant rate. The current in the second coil is also increased at the same rate. At a certain instant of time, the power given to the two coils is the same. At that time the current, the induced voltage and the energy stored in the first coil are $i _1, V_1$ and $W_1$ respectively. Corresponding values for the second coil at the same instant are $i _2, V_1$ and $W_2$  respectively. Then
→
When a negatively charged conductor is connected to earth
→
According to the electromagnetic wave theory, light consists of electric and magnetic fields which are_____________.
→
Einstein's theory of relativity is based on:
→