MCQ
What should be the angle between two plane mirrors so that whatever be the angle of incidence, the incident ray and the reflected ray from the two mirrors be parallel to each other.....$^o$
- A$60$
- ✓$90$
- C$120$
- D$175$
✓
Answer
Correct option: B.
$90$
b
( b)Incident ray and finally reflected ray are parallel to each other means $\delta = {180^o}$
From $\delta = 360 - 2\theta $$ \Rightarrow 180 = 360 - 2\theta $$ \Rightarrow \theta = {90^o}$
( b)Incident ray and finally reflected ray are parallel to each other means $\delta = {180^o}$
From $\delta = 360 - 2\theta $$ \Rightarrow 180 = 360 - 2\theta $$ \Rightarrow \theta = {90^o}$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
In a forward biased $p-n$ junction diode, the potential barrier in the depletion region will be of the form
→An element $d l=d x \hat{l}$ (where, $d x=1\, cm$ ) is placed at the origin and carries a large current $i=10 A$. What is the magnetic field on the $Y$ -axis at a distance of $0.5\, m$ ?
→Adielectric slab is inserted between the plates of an isolated charged capacitor. Which of the following quantities will remain the same?
A solid sphere and a disc of same mass and radius starts rolling down a rough inclined plane, from the same height the ratio of the time taken in the two cases is
The pressure of air in a soap bubble of $0.7\,cm$ diameter is $8\, mm$ of water above the pressure outside. The surface tension of the soap solution is ........ $dyne/cm$
→A stone of mass of $16\, kg$ is attached to a string $144 \,m$ long and is whirled in a horizontal circle. The maximum tension the string can withstand is $16$ Newton. The maximum velocity of revolution that can be given to the stone without breaking it, will be ....... $ms^{-1}$
→The human eye has a lens which has a
Radius of central zone of circular zone plate is $2.3\,mm.$ Wavelength of incident light is $5893\,\,Å.$ Source is at a distance of $6\,m.$ Then the distance of first image will be.....$m$
→Find the reading of spring balance as shown in figure. Assume that mass $M$ is in equilibrium. All surfaces are smooth ....... $N$
→The refracting angle of a prism is $A,$ and refractive index of the material of the prism is $cot\left( {\frac{A}{2}} \right)$. The angle of minimum deviation is
→