Periscope is used for:

observation beyond the obstruction

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watching TV more clearly

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viewing nearby objects by persons suffering from visual deformities

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all of these

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Solution

The correct option is B observation beyond the obstruction
Periscope, which works on the principle of reflection of light, is used to make observation beyond obstruction in the direct line of sight.

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Similar questions

A person who can see nearby objects clearly, but cannot see distant objects distinctly is said to be suffering from

A person cannot see the instant objects clearly (though he can see the nearby objects clearly). He is suffering from the defect of vision is called:

(a) hypermetropia

(b) myopia

(d) cataract

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