MCQ
When light wave suffers reflection at the interface from air to glass, the change in phase of the reflected wave is equal to
- A$0$
- B$\frac{\pi }{2}$
- ✓$\pi $
- D$2\pi $
✓
Answer
Correct option: C.
$\pi $
c
(c) When light is reflected from denser medium, a phase difference of $\pi $always occurs.
(c) When light is reflected from denser medium, a phase difference of $\pi $always occurs.
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 order to raise a mass of $100\,kg$ a man of mass $60\,kg$ fastens a rope to it and passes the rope over a smooth pulley. He climbs the rope with an acceleration $5g/4$ relative to the rope. The tension in the rope is ....... $N$. $(g = 10\,m/s^2)$
→Two identical spheres each of mass $2 \mathrm{~kg}$ and radius $50 \mathrm{~cm}$ are fixed at the ends of a light rod so that the separation between the centers is $150 \mathrm{~cm}$. Then, moment of inertia of the system about an axis perpendicular to the rod and passing through its middle point is $\frac{x}{20} \mathrm{~kg} \mathrm{~m}^2$, where the value of $\mathrm{x}$ is____.
→A person uses a lens of power $+ 3D $ to normalise vision. Near point of hypermetropic eye is.......$m$
→In the given progressive wave equation, what is the maximum velocity of particle $Y = 0.5\sin (10\pi t - 5x) cm$
→Resolving power of a microscope can $NOT$ be increased by
→A body $A$ moves with a uniform acceleration $a$ and zero initial velocity. Another body $B$, starts from the same point moves in the same direction with a constant velocity $v$. The two bodies meet after a time $t$. The value of $t$ is
→The weight of a body in water is one third of its weight in air. The density of the body is ....... $g / cm ^3$
→In which of the following ionic bond is present
If one mole of an ideal gas at $\left( P _{1}, V _{1}\right)$ is allowed to expand reversibly and isothermally ($A$ to $B$ ) its pressure is reduced to one-half of the original pressure (see $figure$). This is followed by a constant volume cooling till its pressure is reduced to one-fourth of the initial value $( B \rightarrow C ) .$ Then it is restored to its initial state by a reversible adiabatic compression ($C$ to $A$). The net workdone by the gas is equal to ...... .
→Points $A$ and $B$ are situated perpendicular to the axis of a $2\,cm$ long bar magnet at large distances $X$ and $3X$ from its centre on opposite sides. The ratio of the magnetic fields at $ A$ and $B$ will be approximately equal to
→