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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Two plane mirrors. A and B are aligned parallel to each other, as shown in the figure. A light ray is incident at an angle of 30° at a point just inside one end of A. The plane of incidence coincides with the plane of the figure. The maximum number of times the ray undergoes reflections (including the first one) before it emerges out is
|
(a) 28 |
(b) 30 |
(c) 32 |
(d) 34 |
The composition of an a -particle can be expressed as
|
(a) 1 P + 1 N |
(b) 1 P + 2 N |
(c) 2 P + 1 N |
(d) 2 P + 2 N |
Due to the flow of current in a circular loop of radius R, the magnetic induction produced at the centre of the loop is B. The magnetic moment of the loop is (
|
(a) |
(b) |
(c) |
(d) |
The energy of a photon of wavelength 
is given by
|
(a) h |
(b) ch |
(c) |
(d) |
Energy of 1g uranium is equal to
|
(a) 9.0 |
(b) 9.0 |
(c) 3.0 |
(d) 3.0 |
Radio waves and visible light in vacuum have
|
(a) Same velocity but different wavelength |
|
(b) Continuous emission spectrum |
|
(c) Band absorption spectrum |
|
(d) Line emission spectrum |
The equivalent inductance of two inductances is 2.4 henry when connected in parallel and 10 henry when connected in series. The difference between the two inductances is
|
(a) 2 henry |
(b) 3 henry |
(c) 4 henry |
(d) 5 henry |
