A concave mirror is placed on a horizontal table, with its axis d… - Vidyadip

MCQ

$A$ concave mirror is placed on a horizontal table, with its axis directed vertically upwards. Let $O$ be the pole of the mirror and $C$ its centre of curvature. $A$ point object is placed at $C$. It has a real image, also located at $C$ (a condition called auto-collimation). If the mirror is now filled with water, the image will be:

A
real, and will remain at $C$
B
real, and located at a point between $C$ and $\infty$
C
virtual, and located at a point between $C$ and $O.$
✓
real, and located at a point between $C$ and $O.$

✓

Answer

Correct option: D.

real, and located at a point between $C$ and $O.$

d
As a result of water the apparent height of source will be beyond $\mathrm{C}$, at $\mathrm{C}^{\prime} \cdot \mathrm{OC}^{\prime}=$ $R\mu$. So its image I' will not be formed at $C$ but it will be formed between $C$ and focus $F$ of the mirror. But again in the return path of rays they will be again refracted at water to air boundary and final image I will be further shifted downwards towards $O.$

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

JEE STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

The range of the projectile projected at an angle of $15^{\circ}$ with horizontal is $50\,m$. If the projectile is projected with same velocity at an angle of $45^{\circ}$ with horizontal, then its range will be $........\,m$

Two stones of different masses are dropped simultaneously from the top of a building

If in a coil rate of change of area is $5$ m$^2$/milli second and current become $1 \,amp$ from $2\, amp$ in $2 \times {10^{ - 3}}\,sec.$ If magnitude of field is $1$ tesla then self inductance of the coil is....$H$

A sample contains mixture of helium and oxygen gas. The ratio of root mean square speed of helium and oxygen in the sample, is $:$

Due to a small magnet intensity at a distance $x$ in the end on position is $9$ $Gauss$. What will be the intensity at a distance $\frac{x}{2}$ on broad side on position..... $Gauss$

At what height above the surface of earth the value of $"g"$ decreases by $2 \%$ ..... $km$ [radius of the earth is $6400 \,km$ ]

A body of mass $1 kg$ begins to move under the action of a time dependent force $\vec{F}=\left(t \hat{i}+3 t^2 \hat{ j }\right) N$. where $\hat{i}$ and $\hat{j}$ are the unit vectors along $x$ and $y$ axis. The power developed by above force, at the time $t=2 s$. will be $..............W$.

An electron enters between two horizontal plates separated by $2\,mm$ and having a potential difference of $1000\,V$. The force on electron is

A pendulum of length $l = 1\,m$ is released from $\theta _0 = 60^o.$ The rate of change of speed of the bob at $\theta = 30^o$ is ........ $m/s^2$ $(g = 10\,m/s^2)$

To observe a stationary interference pattern formed by two light waves, it is not necessary that they must have :