A rectangular block of glass ABCD has a refractive index 1.6. A p… - Vidyadip

MCQ

A rectangular block of glass $\text{ABCD}$ has a refractive index $1.6.$ A pin is placed midway on the face $AB ($Fig$)$. When observed from the face $AD$, the pin shall:

A
Appear to be near $A.$
B
Appear to be near $D.$
C
Appear to be at the centre of $AD.$
✓
Not be seen at all.

✓

Answer

Correct option: D.

Not be seen at all.

We know that, $\Box=\frac{1}{\sin\text{C}}$ Substituting $\Box=1.6$, we get $C = 38.7^\circ$ As long as angle of incidence on $AD$ of the ray emanating from pin is greater than the critical angle, the light suffers from total internal reflection and the pin cannot be seen through $AD.$

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 and Optical Instruments→Ray Optics and Optical Instruments — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Which of following can not be polarised

Photon and electron are given same energy ($10^{-20} \mathrm{~J}$). Wavelength associated with photon and electron are $\lambda_{\mathrm{ph}}$ and $\lambda_{\mathrm{el}}$ then correct statement will be

The angle of prism is $30^o$. The rays incident at an angle of $60^o$ at one refracting face suffer a deviation of $30^o$. Then the angle of emergence is......$^o$

The energy that should be added to an electron to reduce its de Broglie wavelength from one nm to 0.5 nm is

A pole is vertically submerged in swimming pool, such that it gives a length of shadow $2.15 \,m$ within water when sunlight is incident at an angle of $30^{\circ}$ with the surface of water. If swimming pool is filled to a height of $1.5\,m$, then the height of the pole above the water surface in centimetres is $\left(\eta_W=4 / 3\right)........$

The radio of deBroglie wavelengths of a proton and an alpha particle of same energy is:

An electron of mass m and charge q is travelling with a speed v along a circular path of radius r at right angles to a uniform of magnetic field B. If speed of the electron is doubled and the magnetic field is halved, then resulting path would have a radius of

A man runs towards a mirror at a speed 15 m/s The speed of the image relative to the man is

Which one of the following is not electromagnetic in nature

As per the given figure, if $\frac{ dI }{ dt }=-1 A / s$ then the value of $V _{ AB }$ at this instant will be $................V$.