Is it true that two identical prisms can be placed in such a way that a narrow beam of white light incident on one prism emerges out of the second prism as a white light?

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True

False

answer is A.

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Detailed Solution

The above statement is true.
Two identical prisms can be placed in such a way that a narrow beam of white light incident on one prism emerges out of the second prism as a white light. This experiment is done by using two identical prisms

P_{1}

and

P_{2}

. Both the prisms are made up of same material and are having same refractive index A. The prisms

P_{1}

and

P_{2}

are arranged in such a way that

P_{1}

is upward and

P_{2}

is down ward as shown in figure1. Sunlight from a narrow slit

' S'

is made to fall on prism

P_{1}

. The prism

P_{1}

has its base down ward so it will disperse light into its constituent colours (i.e. VIBGYOR). The dispersed light will get deviated towards the base of prism while emerging out. The dispersed light coming out of