Download App

Wave Optics — Physics STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 SciencePhysicsWave Optics1 Mark
MCQ
The optical path difference between two identical light waves arriving at a point is $31.5 \lambda$, where ' $\lambda$ ' is the wavelength of light used. The point is [Two light sources are coherent]
  • A
    neither bright nor dark
  • ✓
    dark
  • C
    bright
  • D
    alternatively bright and dark.
✓

Answer

Correct option: B.
dark
(b) : As $\Delta x=31.5 \lambda ; \Delta x=63\left(\frac{\lambda}{2}\right)$
The above is an odd multiple of $\frac{\lambda}{2}$ i.e., a minimum will be formed and hence the point will be dark.

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→Maharashtra Board STD 12 Science question papers→Maharashtra Board question paper generator→

Similar questions

The maximum velocity of a particle performing S.H.M. is 'V'. If the periodic time is made $\left(\frac{1}{3}\right)^{ rd }$ and the amplitude is doubled, then the new maximum velocity of the particle will be
→
A wheel of moment of inertia $2 kg m ^2$ is rotating about an axis passing through centre and perpendicular to its plane at a speed $60 rad / s$. Due to friction, it comes to rest in 5 minutes. The angular momentum of the wheel three minutes before it stops rotating is
→
In a single slit diffraction pattern, the first minima obtained with the red light of wavelength 6600 A.U. coincides with the first maxima f some other wavelength λ then is ______ 
→
There is one closed pipe whose third overtone is in resonance with the upper string, which is in the $4^{\text {th }}$ overtones with an open pipe, then
→
The work done in carrying a charge $Q$ once round a circle of radius $r$ with charge $q$ at the centre of the circle is
→
A mass $m_1$ connected to a horizontal spring performs $\text{S.H.M.}$ with amplitude $A$. While mass $m_1$ is passing through mean position another mass $m_2$ is placed on it so that both the masses move together with amplitude $A_1$. The ratio of $\frac{A_1}{A}$ is $m_{2 <}m_1$
→
The radii of two soap bubbles are $r_1$ and $r_2$. In isothermal condition they combine with each other to form a single bubble. The radius of resultant bubble is
→
The coefficient of performance of a Carnot refrigerator is 4. If $T _{ C }=250 K$, then $T _H=$
→
In the hysteresis curve the value of magnetization $(B)$ which will be present in a substance when value of magnetizing force $(H)$ is made zero $(H=0)$ is called as
→
Which of the following phenomenon proves that light is a transverse wave?
→