QJEEM21Pha7e1: JEE Main 2021 Physics - Class 12 JEEM21Pha7e1 Solution: The image of an object placed in air formed by a convex…

Question

Verified Solution • 2025–26 Session moderate

The image of an object placed in air formed by a convex refracting surface is at a distance of 10 m behind the surface. The image is real and is at

{{{2^{rd}}} \over 3}

of the distance of the object from the surface. The wavelength of light inside the surface is

{2 \over 3}

times the wavelength in air. The radius of the curved surface is

{x \over {13}}

m. The value of 'x' is ___________.

Accepted Answer

{{{\mu _2}} \over v} - {{{\mu _1}} \over u} = {{{\mu _2} - {\mu _1}} \over R}

{\mu _1} = 1

,

{\mu _2} = 1.5

{{1.5} \over { + 10}} - {1 \over { - 15}} = {{1.5 - 1} \over { + R}}

R = {{30} \over {13}}

m

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