The power of the lens.
Explanation:
For a simple microscope in normal adjustment, the object is placed at a distance equal to f (the focal length) from the lens, And the angular magnification is given by the relation
$\text{m}=\frac{\text{D}}{\text{f}}$
for $\text{u}<\text{f},\text{m}=\frac{\text{D}}{\text{f}}+1$
power of lens
$=\frac{1}{\text{f}}$Angular magnification depends on power.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Focal length of a convex lens will be maximum for
|
(a) Blue light |
(b) Yellow light |
(c) Green light |
(d) Red light |
A lamp emits monochromatic green light uniformly in all directions. The lamp is 3% efficient in converting electrical power to electromagnetic waves and consumes 100W of power. The amplitude of the electric field associated with the electromagnetic radiation at a distance of 10m from the lamp will be
|
(a) 1.34 V/m |
(b) 2.68 V/m |
(c) 5.36 V/m |
(d) 9.37 V/m |
The total power content of an AM wave is 900 W. For 100% modulation, the power transmitted by each side band is
|
(a) 50 W |
(b) 100 W |
(c) 150 W |
(d) 200 W |
PN-junction diode works as a insulator, if connected
| (a) To A.C. | (b) In forward bias | (c) In reverse bias | (d) None of these |
An electron is moving in electric field and magnetic field it will gain energy from
|
(a) Electric field |
(b) Magnetic field |
(c) Both of these |
(d) None of these |
The current flowing in a copper voltameter is 1.6 A. The number of 
ions deposited at the cathode per minute are
|
(a) 1.5 |
(b) 3 |
(c) 6 |
(d) 1 |
