#### Question

The width of plane incident wavefront is found to be doubled on refraction in denser medium. If it makes an angle of 65° medium. with the normal, calculate the refractive index for the denser medium.

#### Solution

Given: i = 65°, CD = 2AB

To find: Refractive index (μ)

formulae:

`cosi/cosr="AB"/"CD"` ..........(1)

`mu=sini/sinr` ...................(2)

From formula 1

`cos65^@/cosr="AB"/"2AB"`

`0.4226/cosr=1/2`

`cosr=32^@16'`

from formula 2

`mu=sin65^@/sin(32^@16')`

`mu=1.697`

The refractive index for the denser medium is 1.697.

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#### APPEARS IN

Solution The Width of Plane Incident Wavefront is Found to Be Doubled on Refraction in Denser Medium. If It Makes an Angle of 65° Medium. with the Normal, Calculate the Refractive Index for the Denser Medium. Concept: Measurement of Wavelength by Biprism Experiment.