If i denotes a unit vector along incident light ray, r a unit vec… - Vidyadip

MCQ

If $\hat i$ denotes a unit vector along incident light ray, $\hat r$ a unit vector along refracted ray into a medium of refractive index $\mu $ and $\hat n$ unit vector normal to boundary of medium directed towards incident medium, then law of refraction is

A
$\hat i\,.\,\hat n = \mu (\hat r\,.\,\hat n)$
B
$\hat i \times \hat n = \mu (\hat n \times \hat r)$
✓
$\hat i \times \hat n = \mu (\hat r \times \hat n)$
D
$\mu (\hat i \times \hat n) = \hat r \times \hat n$

✓

Answer

Correct option: C.

$\hat i \times \hat n = \mu (\hat r \times \hat n)$

c
(c) Snell’s law in vector form is $\hat i \times \hat n = \mu (\hat r \times \hat n)$

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 9. Ray optics abd optical instruments→9. Ray optics abd optical instruments — all question types→Physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

Wires P and Q have the same resistance at ordinary (room) temperature. When heated, resistance of P increases and that of Q decreases. We conclude that

A small rectangular loop of wire in the plane of the paper is moved with uniform speed across a limited region of uniform magnetic field perpendicular to the plane of the paper as shown below. Which graph would best represent the variation of the electric current $I$ in the wire with time $t$ ?

A $20\,cm$ long metallic rod is rotated with $210\,rpm$ about an axis normal to the rod passing through its one end. The order end of the rod is in contact with a circular metallic ring. A constant and uniform magnetic field $0.2\,T$ parallel to the axis exists everywhere. The emf developed between the centre and the ring is $.......\,mV$.Take $\pi=\frac{22}{7}$

In the visible region of the spectrum the rotation of the place of polarization is given by $\theta = a + \frac{b}{{{\lambda ^2}}}$. The optical rotation produced by a particular material is found to be $30^o $ per mm at $\lambda = 5000$Å and $50^o $ per mm at $\lambda = 4000{\rm{Å}}$. The value of constant $a $ will be

A man wearing glasses of focal length +1m cannot clearly see beyond 1m:

A positive charge $q$ is placed in a spherical cavity made in a positively charged sphere. The centres of sphere and cavity are displaced by a small distance $\vec l $ . Force on charge $q$ is :

Pick out the application of potentiometer from the following.

Light of wavelength $5000\,\mathop A\limits^o$ is incident on a single slit such that first minima is formed at a distance $5\, mm$ from the centre. If the screen is placed $2\, m$ away then find the width of slit.....$ mm$

A $220\, V$, $50 \,Hz$ $ac$ source is connected to an inductance of $0.2\,H$ and a resistance of $20\, ohm$ in series. What is the current in the circuit.......$A$

Two capacitors having capacitance $C _{1}$ and $C _{2}$ respectively are connected as shown in figure. Initially, capacitor $C _{1}$ is charged to a potential difference $V$ volt by a battery. The battery is then removed and the charged capacitor $C_{1}$ is now connected to uncharged capacitor $C _{2}$ by closing the switch $S$. The amount of charge on the capacitor $C _{2}$, after equilibrium is