The critical angle of a medium for a specific wavelength, if the … - Vidyadip

MCQ

The critical angle of a medium for a specific wavelength, if the medium has relative permittivity $3$ and relative permeability $\frac{4}{3}$ for this wavelength, will be.....$^o$

A
$60$
B
$15$
C
$45$
✓
$30$

✓

Answer

Correct option: D.

$30$

d
$\sin \theta_{\mathrm{C}}=\frac{1}{\mu}=\frac{1}{\sqrt{3 \times 4 / 3}}$

$\theta_{\mathrm{C}}=30^{\circ}$

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

The mutual inductance between two coils is 1.25 henry. If the current in the primary changes at the rate of 80 ampere/second, then the induced e.m.f. in the secondary is

The pointer of a dead-beat galvanometer gives a steady deflection because

In hydrogen atom, an electron is revolving in the orbit of radius 0.53$A^0$ with $6.6\times 10^{15}$ rotations/second. Magnetic field produced at the centre of the orbit is

A man can see the objects upto a distance of one metre from his eyes. For correcting his eye sight so that he can see an object at infinity, he requires a lens whose power is

A varying current in a coil change from $10A$ to 0 in $0.5 \sec$. If the average emf induced in the coil is $220V,$ the self inductance of the coil is:

An electron (charge $= 1.6 × 10^{-19}$ coulomb) is moving in a circle of radius $5.1 × 10^{-11}\,m$ at a frequency of $6.8 × 10^{15} $ revolutions/sec. The equivalent current is approximately

Self induction of a solenoid is

Which statement is correct

The power (in diopters) of an equiconvex lens with radii of curvature of $10\, cm$ and refractive index of $1.6$ is

If a lens is cut into two pieces perpendicular to the principal axis and only one part is used, the intensity of the image