(17) For what time does the effect of image persist on retina after the
object is removed ?
A. to second B. 10 second
C. 16 second D. Io second
(18) Which instrument is used by the submarine under the water to see
the steamer on the surface of the ocean ?
A. Kaleidoscope B. Periscope C. Telescope D. Searchlight
(19) Deficiency of which vitamin in diet is responsible for the defect in
the eye?
A. Vitamin C B. Vitamin A C. Vitamin B D. Vitamin D
(20) What is a phenomenon of splitting of sunlight into seven colours
called?
A. Reflection B. Spectrum
C. Dispersion D. Diffusion
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Answer:
17) An image stays on the retina for about 1/16 of a second
18) Periscope is an instrument used in submarines to observe activity above the water surface while the submarine is submerged
19) B. Vitamin A
20)The phenomenon of splitting of light into its component colors is called dispersion.
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