A light beam is being reflected by using two mirrors, as in a periscope used in submarines. If one of the mirrors rotates by an angle q, the reflected light will deviate from its original path by the angle
|
(a) 2θ |
(b) 0° |
(c) θ |
(d) 4θ |
(a) 2θ
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Photoelectric effect was successfully explained first by
|
(a) Planck |
(b) Hallwash |
(c) Hertz |
(d) Einstein |
Select the correct alternative, The angle between the normal and refracted ray is called:
The power of an achromatic convergent lens of two lenses is + 2D. The power of convex lens is + 5D. The ratio of dispersive power of convex and concave lens will be
|
(a) 5 : 3 |
(b) 3 : 5 |
(c) 2 : 5 |
(d) 5 : 2 |
The ratio of momenta of an electron and an α- particle which are accelerated from rest by a potential difference of 100 V is
|
(a) 1 |
(b) |
(c) |
(d) |
Finger prints on a piece of paper may be detected by sprinkling fluorescent powder on the paper and then looking it into
|
(a) Mercury light |
(b) Sunlight |
(c) Infrared light |
(d) Ultraviolet light |
The relation between a and b parameters of current gains for a transistors is given by
|
(a) α = |
(b) α = |
(c) α = 
|
(d) α = 
|
