Which of the following uses “shadows” as its working principle?

Only 1

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1 and 2

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Only 2

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1, 2 and 3

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Solution

The correct option is C Only 2
A sundial indicates time with the help of length and direction of the shadow of an object formed in sunlight.
Mirror works on the principle of reflection of light.
Pinhole camera works on the principle of rectilinear propagation of light.

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Statement I :

Statement II :

State the principle behind the working of a pinhole camera. [1 MARK]

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