MCQ
In human eye the focussing is done by
- ATo and fro movement of eye lens
- BTo and fro movement of the retina
- ✓Change in the convexity of the lens surface
- DChange in the refractive index of the eye fluids
✓
Answer
Correct option: C.
Change in the convexity of the lens surface
Convexity to lens changes by the pressure applied by ciliary muscles.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A capacitor is a perfect insulator for
The mutual inductance between a primary and secondary circuits is $0.5 \mathrm{H}$. The resistances of the primary and the secondary circuits are $20\ \mathrm{ohms}$ and $5\ \mathrm{ohms}$ respectively. To generate a current of $0.4 \mathrm{~A}$ in the secondary, current in the primary must be changed at the rate of
→A small bar magnet $A$ oscillates in a horizontal plane with a period $T$ at a place where the angle of dip is 60 . When the same needle is made to oscillate in a vertical plane coinciding with the magnetic meridian, its period will be
→A thin metal disc of radius $r$ floats on water surface and bends the surface downwards along the perimeter making an angle $\theta$ with vertical edge of the disc. If the disc displaces a weight of water $W$ and surface tension of water is $T$, then the weight of metal disc is
→A uniform cube is subjected to volume compression. If each side is decreased by $1 \%$, then bulk strain is
→At a certain place a magnet makes $30$ oscillations per minute. At another place where the magnetic field is double, its time period will be
→Work of electric motor is
A stone is projected from the ground with velocity $25 m / s$. Two seconds later, it just clears a wall $5 m$ high. The angle of projection of the stone is $\left(g=10 m / \sec ^2\right)$
→An object $5 \mathrm{~cm}$ tall is placed $1 \mathrm{~m}$ from a concave spherical mirror which has a radius of curvature of $20 \mathrm{~cm}$ The size of the image is
→A tank is filled with water up to a height $H$. Water is allowed to come out of a hole $P$ in one of the walls at a depth $D$ below the surface of water. Express the horizontal distance $x$ in terms of $H$ and $D$
→