A diverging beam of light from a point source S having divergence angle a, falls symmetrically on a glass slab as shown. The angles of incidence of the two extreme rays are equal. If the thickness of the glass slab is t and the refractive index n, then the divergence angle of the emergent beam is
|
(a) Zero |
(b) α |
(c) |
(d) 2 |
(b) α
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A person wears glasses of power – 2.5 D. The defect of the eye and the far point of the person without the glasses are respectively
|
(a) Farsightedness, 40 cm |
(b) Nearsightedness, 40 cm |
|
(c) Astigmatism, 40 cm |
(d) Nearsightedness, 250 cm |
Which of the following is deflected by electric field
|
(a) X-rays |
(b) γ -rays |
(c) Neutrons |
(d) α -particles |
In a diode AM-detector, the output circuit consist of R = 1kW and C = 10 pF. A carrier signal of 100 kHz is to be detected. Is it good
|
(a) Yes |
(b) No |
|
(c) Information is not sufficient |
(d) None of these |
As our eyes can not retrace the bent path of light, a stick, dipped in water, appears:
On a glass plate a light wave is incident at an angle of 60°. If the reflected and the refracted waves are mutually perpendicular, the refractive index of material is
|
(a) |
(b) |
(c) |
(d) |
