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
c
(c) Convexity to lens changes by the pressure applied by ciliary muscles.
(c) 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
If a voltage applied to an $X$ - ray tube is increased to $1.5$ times the minimum wavelength $({\lambda _{\min }})$ of an $X$ - ray continuous spectrum shifts by $\Delta \lambda = 26\,pm$. The initial voltage applied to the tube is
→The electric flux through a certain area of dielectric is $8.76 \times 10^3 t^4$. The displacement current through the area is $12.9$ pA at $t =26.1 \ ms$. Find the dielectric constant of the material.
→Which of the following shown particle nature of light
A charge $Q$ is distributed over a line of length $L.$ Another point charge $q$ is placed at a distance $r$ from the centre of the line distribution. Then the force expericed by $q$ is
→The property which differentiates two kinds of charges is called $........$?
→Three rings, each having equal radius $R,$ are placed mutually perpendicular to each other and each having its centre at the origin of co-ordinate system. If current $I$ is flowing thriugh each ring then the magnitude of the magnetic field at the common centre is
→The identical metal plates with large surface areas are kept parallel to each other as shown in figure. The left most plate is given a charge $Q$ , the rightmost a charge $-2Q$ and the middle one remains neutral. Find the charge appearing on the outer surface of the rightmost plate
→When a certain circuit consisting of a constant e.m.f. E an inductance L and a resistance R is closed, the current in, it increases with time according to curve 1. After one parameter (E, L or R) is changed, the increase in current follows curve 2 when the circuit is closed second time. Which parameter was changed and in what direction
A positively charged ball hangs from a silk thread. We put a positive test charge $q_0$ at a point and measure F/$q_0$, then it can be predicted that the electric field strength E
→A capacitor having capacitance C is charged to a voltage V. It is then removed and connected in parallel with another identical capacitor which is uncharged. The new charge on each capacitor is now