A real image is formed by:
Explanation:
When the refracting or reflecting rays actually intersect, rather than pretending to be meeting at a point, a real image is formed. A real image hence can be obtained on a screen.
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Three equal capacitors, each with capacitance C are connected as shown in figure. Then the equivalent capacitance between A and B is
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(a) C |
(b) 3C |
(c) |
(d) |
$\overrightarrow{\text{F}}.\overrightarrow{\text{a}}$
$\overrightarrow{\text{v}}.\overrightarrow{\text{r}}$
$\overrightarrow{\text{a}}.\overrightarrow{\text{r}}$
$\overrightarrow{\text{F}}.\overrightarrow{\text{r}}$
When light is incident on a doubly refracting crystal, two refracted rays-ordinary ray (O-ray) and extra ordinary ray (E-ray) are produced. Then
|
(a) Both O-ray and E-ray are polarised perpendicular to the plane of incidence |
|
(b) Both O-ray and E-ray are polarised in the plane of incidence |
|
(c) E-ray is polarised perpendicular to the plane of incidence and O-ray in the plane of incidence |
|
(d) E-ray is polarised in the plane of incidence and O-ray perpendicular to the plane of incidence |
Mean life of a radioactive sample is 100 seconds. Then its half life (in minutes) is
|
(a) 0.693 |
(b) 1 |
(c) 10-4 |
(d) 1.155 |
$\text{P}=\lim_\limits{\triangle\text{s}\rightarrow0}\frac{\text{F}}{\triangle\text{s}}$ and $\text{P}_1-\text{P}_2-\text{pgz}$
In an elevator accelerating upward.A thin convex lens of refractive index 1.5 has a focal length of 15 cm in air. When the lens is placed in liquid of refractive index 4/3 , its focal length will be
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(a) 15 cm |
(b) 10 cm |
(c) 30 cm |
(d) 60 cm |
