MCQ
Two plane mirrors at an angle such that a ray incident on a mirror undergoes a total deviation of $240^o$ after two reflections.
  • A
    the angle between the mirror is $60^o$
  • B
    the number of images formed by this system will be $5$, if an object is placed symmetrically between the mirrors.
  • C
    the no. of images will be $5$ if an object is kept unsymmetrically between the mirrors.
  • All of the above

Answer

Correct option: D.
All of the above
d

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

Similar questions

A tangent galvanometer has a coil of $100$ $turns$ and a radius of $20\,cm$. The horizontal component of the earth's magnetic field is $B_H = 3\times10^{-5}\,T$. Find the current which gives a deflection of $45^o$.
An object of mass $m$ is suspended at the end of a massless wire of length $L$ and area of cross$-$section, $A$. Young modulus of the material of the wire is $Y$. If the mass is pulled down slightly its frequency of oscillation along the vertical direction is
Electron in hydrogen atom first jumps from third excited state to second excited state and then from second excited to the first excited state. The ratio of the  wavelengths $\lambda_1 :\lambda_2$ emitted in the two cases is
A river gradually deepens, from a depth of $4 \ m$ to a depth of $8\  m$ as shown. The width, $W$, of the river does not change. At the depth of $4 \ m$, the river's speed is $12\  m/sec.$ Its  elocity at the $8\  m$ depth is ......... $m/sec$
A light inextensible string that goes over a smooth fixed pulley as shown in the figure connects two blocks of masses $0.36 \mathrm{~kg}$ and $0.72 \mathrm{~kg}$. Taking $g=10 \mathrm{~m} / \mathrm{s}^2$, find the work done (in joules) by the string on the block of mass $0.36 \mathrm{~kg}$ during the first second after the system is released from rest.
If two soap bubbles of different radii are connected by a tube,
Match the LIST-I with LIST-II
LIST-ILIST-II
A.Boltzmann constantI.$\mathrm{ML}^{2} \mathrm{~T}^{-1}$
B.Coefficient of viscosityII.MLT $^{-3} \mathrm{~K}^{-1}$
C.Planck's constantIII.$\mathrm{ML}^{2} \mathrm{~T}^{-2} \mathrm{~K}^{-1}$
D.Thermal conductivityIV.$\mathrm{ML}^{-1} \mathrm{~T}^{-1}$
Choose the correct answer from the options given below :
In the figure a capacitor is filled with dielectrics. The resultant capacitance is
If $L = 2.331\,cm,\;B = 2.1\,cm$, then $L + B = $
A  particle of mass  $m$ is projected with velocity $v$ making an angle of $45^\circ$ with the horizontal. When the particle lands on the level ground the magnitude of the change in its momentum will be