The instrument that is based on the principle that when an object is placed between first principal focus and the optic centre of convex lens, an upright, virtual and enlarged image on the same side of the object is formed, is:
Explanation:
In astronomical telescope 2 convex lens called eyepiece and objective lens are used and object is placed before eyepiece lens, such that final image inverted, a camera and eye also form inverted image on the screen.
Whereas simple microscope gives an erect, virtual and enlarged image of the object placed between first principal focus and the optic nerve of the convex lens.
In a projector, the image formed is real, inverted magnified on the other side of the lens. This inverted image is again inverted by the film.
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The light rays having photons of energy 1.8 eV are falling on a metal surface having a work function 1.2 eV. What is the stopping potential to be applied to stop the emitting electrons
|
(a) 3 eV |
(b) 1.2 eV |
(c) 0.6 eV |
(d) 1.4 eV |
Which of the following isotopes is used for the treatment of cancer
|
(a) |
(b) |
(c) |
(d) |
The rate of disintegration was observed to be 
disintegrations per sec when its half life period is 1445 years. The original number of particles are
(a) 8.9 
|
(b) 6.6
|
(c) 1.4 
|
(d) 1.2 
|
The work function of a metal is
|
(a) The energy for the electron to enter into the metal |
|
(b) The energy for producing X-ray |
|
(c) The energy for the electron to come out from metal surface |
|
(d) None of these |
Sum of the two binary numbers 
and 
is
|
(a) |
(b) |
(c) |
(d) |
The current flowing in a copper voltameter is 3.2 A. The number of copper ions (
deposited at the cathode per minute is
|
(a) 0.5 |
(b) 1.5 |
(c) 3 |
(d) 6 |
