MCQ
A transparent cube of 15 cm edge contains a small air bubble. Its apparent depth when viewed through one face is 6 cm and when viewed through the opposite face is 4 cm. Then the refractive index of the material of the cube is
  • A
    2.0
  • B
    2.5
  • C
    1.6
  • 1.5

Answer

Correct option: D.
1.5
 1.5

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

Similar questions

Although we can know with great precision the pattern formed by huge numbers of photons passing through the lines on a diffraction grating, we cannot know at all where one single photon will go when it passes through the diffraction grating.
This statement describes the truth revealed by what theory?
Two concentric coplanar circular loops of radii $r_1$ and $r_2$ carry currents of respectively $i_1$ and $i_2$ in opposite directions (one clockwise and the other anticlockwise.) The magnetic induction at the centre of the loops is half that due to $i_1$ alone at the centre. If $r_2=2r_1$. the value of $i_2/i_1$ is
A light balloon filled with helium of density $\rho_{He}$ is tied to a light string of length $L.$ The string is tied to the ground forming an "inverted" simple pendulum (figure). If the balloon is displaced slightly from equilibrium as in figure and released, the period of the motion is. Take the density of air to be $\rho_{air}$. Assume the air applies a buoyant force on the balloon but does not otherwise affect its motion.)
In a diffraction pattern due to a single slit of width $a$, the first minimum is observed at an angle $30^o $ when light of wavelength $5000 \;\mathring A$ is incident on the slit. The first secondary maximum is observed at an angle of
The three resistance of equal value are arranged in the different combinations shown below. Arrange them in increasing order of power dissipation.
Let Q and W denote the amount of heat given to an ideal gas and the work done by it in an isothermal process.
The coercivity of a small magnet where the ferromagnet gets demagnetized is $3 \times 10^3 Am ^{-1}$. The current required to be passed in a solenoid of length $10 \ cm$ and number of turns $100$ , so that the magnet gets demagnetized when inside the solenoid, is:
A thin cylindrical rod of length $10\,cm$ is placed horizontally on the principle axis of a concave mirror of focal length $20\,cm$. The rod is placed in a such a way that mid point of the rod is at $40\,cm$ from the pole of mirror. The length of the image formed by the mirror will be $\frac{x}{3} cm$. The value of $x$ is $............$.
A proton (mass m and charge +e) and an α - particle (mass 4m and charge +2e) are projected with the same kinetic energy at right angles to the uniform magnetic field. Which one of the following statements will be true
In an $n-p-n$ transistor $10^{10}$ electron enter the emitter in $10^{-6}\, s$. If $2\%$ of the electrons are lost in the base, the current amplification factor is