6. An image orthicon camera target is :
(a) Always anode potential stabilised
(b) Always cathode potential stabilised
(c) Either of a and b
(d) None of these
7. The approximate value of target voltage in a standard vidicon is :
(a) 300 V
(b) 30 V to 40 V
(c) Equal to anode voltage
(d) None of these
8. Halo is formed in :
(a) Vidicon
(b) Plumbicon
(c) Image orthicon
(d) Newvicon
9. Target plate of plumbicon consists of :
(a) Antimony
(b) Trisulphide
(c) Selenium tin oxide
(d) Lead oxide
10. In photo emission the number of electron emitted from the target surface :
(a) Varies directly as the wavelength
(b) Varies directly as the frequency of light
(c) is independent of wavelength
(d) None of these
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