What is the stopping potential when the metal with work function 0.6 eV is illuminated with the light of 2 eV
|
(a) 2.6 V |
(b) 3.6 V |
(c) 0.8 V |
(d) 1.4 V |
(d) 1.4 V
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A thin rod of length f/3 lies along the axis of a concave mirror of focal length f. One end of its magnified image touches an end of the rod. The length of the image is
|
(a) f |
(b) |
(c) 2f |
(d) |
A combination of two thin lenses with focal lengths 
and 
respectively forms an image of distant object at distance 60 cm when lenses are in contact. The position of this image shifts by 30 cm towards the combination when two lenses are separated by 10 cm. The corresponding values of and are
|
(a) 30 cm,-60 cm |
(b) 20 cm, -30 cm |
(c) 15 cm, -20 cm |
(d) 12 cm, - 15 cm |
An eye specialist prescribes spectacles having a combination of convex lens of focal length 40 cm in contact with a concave lens of focal length 25 cm. The power of this lens combination in diopters is
|
(a) + 1.5 |
(b) – 1.5 |
(c) + 6.67 |
(d) – 6.67 |
In a Young's experiment, two coherent sources are placed 0.90 mm apart and the fringes are observed one metre away. If it produces the second dark fringe at a distance of 1 mm from the central fringe, the wavelength of monochromatic light used would be
|
(a) 60 |
(b) 10 |
(c) 10 |
(d) 6 |
