Download App

Ray Optics — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsRay Optics1 Mark
MCQ
Light wave enters from medium $1$ to medium $2.$ Its velocity in $2^{\text {nd }}$ medium is double from $1^{\text {st }}$. For total internal reflection the angle of incidence must be greater than
  • ✓
    $ 30^{\circ} $
  • B
    $ 60^{\circ} $
  • C
    $ 45^{\circ} $
  • D
    $ 90^{\circ}$
✓

Answer

Correct option: A.
$ 30^{\circ} $
$ 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 Ray Optics→Ray Optics — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

The image formed by the convex mirror of a real object is larger than the object
→
The equivalent resistance between the points P and Q in the network given here is equal to (given r = $\frac{3}{2} \Omega$)
→
A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is $\frac{4}{3}$ and the fish is $12 \ cm$ below the surface, the radius of this circle in cm is
→
Two point charges +3μC and +8μC repel each other with a force of 40N. If a charge of -5μC is added to each of them, then the force between them will become
→
The susceptibility of a diamagnetic substance is:
→
The potential difference between $A$ and $B$ in the Figure is ................... $\mathrm{V}$
→
An X-ray tube with a copper target emits Cu $K_\alpha$ line of wavelength 1.50 Å. What should be the minimum voltage through which electrons are to be accelerated to produce this wavelength of X rays $(h = 6.63\times 10^{-34} \mathrm{~J}-\mathrm{sec}, \mathrm{c}=3 \times 10^8 \mathrm{~m} / \mathrm{s})$ 
→
The correct symbol for zener diode is
 
→
In a compound microscope, the focal lengths of two lenses are $1.5\, cm$ and $6.25\, cm$. An object is placed at $2\, cm$ from objective and the final image is formed at $25\, cm$ from eye lens. The distance between the two lenses is.....$cm$
→
The radius of the trajectory of a charged particle in a uniform magnetic field is proportional to the:
→