Question
A light beam is being reflected by using two mirrors, as in a periscope used in submarines. If one of the mirrors rotates by an angle $\theta$, the reflected light will deviate from its original path by the angle
✓
Answer
( a)When a mirror is rotated by an angle $\theta$, the reflected ray deviate from its original path by angle $2\theta $.
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
Seawater at a frequency $f =9 \times 10^{2} \,Hz ,$ has permittivity $\varepsilon=80\, \varepsilon_{0}$ and resistivity $\rho=0.25\, \Omega m.$ Imagine a parallel plate capacitor is immersed in seawater and is driven by an alternating voltage source $V ( t )= V _{0} \sin (2 \pi ft ) .$ Then the conduction current density becomes $10^{x}$ times the displacement current density after time $t =\frac{1}{800} \,s$. The value of $x$ is ......... .
$\left(\frac{1}{4 \pi \varepsilon_{0}}=9 \times 10^{9} Nm ^{2} C ^{-2}\right)$
→$\left(\frac{1}{4 \pi \varepsilon_{0}}=9 \times 10^{9} Nm ^{2} C ^{-2}\right)$
If $2.2\, Kwatt$ power is transmitted through a $10\, ohm$ line at $22000\, volt$, the power loss in the form of heat will be ............. $watt$
→The refractive index of a particular material is $1.67 $ for blue light, $1.65$ for yellow light and $1.63$ for red light. The dispersive power of the material is .........
→In a semiconductor the separation between conduction band and valence band is of the order of.....$eV$
→In the circuit shown in the figure below, which of the following statement is incorrect ?
This question has Statement $-1$ and Statement $-2$ . Of the four choices given after the statements, choose the one that best describes the two statements
→Statement $-1$ : Sky wave signals are used for long distance radio communication. These signals are in general, less stable than ground wave signals
Statement $-2$ : The state of ionosphere varies from hour to hour, day to day and season to season
Two water pipes $P$ and $Q$ having diameters $2$$ \times 10^{-2} $ $m$ and $4$ $\times 10^{-2}$ $m$, respectively, are joined in series with the main supply line of water. The velocity of water flowing in pipe $P$ is
→An ideal gas at pressure $P$ and volume $V$ is expanded to volume$ 2V.$ Column $I$ represents the thermodynamic processes used during expansion. Column $II$ represents the work during these processes in the random order.:
→| Column $I$ | Column $II$ |
| $(p)$ isobaric | $(x)$ $\frac{{PV(1 - {2^{1 - \gamma }})}}{{\gamma - 1}}$ |
| $(q)$ isothermal | $(y)$ $PV$ |
| $(r)$ adiabatic | (z) $PV\,\iota n\,2$ |
The correct matching of column $I$ and column $II$ is given by
A cracker rocket is ejecting gases at a rate of $0.05 \,kg / s$ with a velocity $400 \,m / s$. The accelerating force on the rocket is
→For given $\vec E = 2x\hat i + 3y\hat j$, find the potential at $(X, Y)$ if potential at origin is $5\, volts.$
→