#### Question

In a biprism experiment, when a convex lens was placed between the biprism and eyepiece at a distance of 30 cm from the slit, the virtual images of the slits are found to be separated by 7 mm. If the distance between the slit and biprism is 10 cm and between the biprism and eyepiece is 80cm, find the linear magnification of the image.

#### Solution

Given: D = 10 + 80 = 90 cm,

d = 30 cm, d1 = 60 cm

To find: Linear magnification (m)

Formula: `m=d_1/d="v"/u`

Calculation: From formula,

`"v"/u=60/30`

∴ m=2

**The linear magnification of the image is 2.**

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#### APPEARS IN

Solution In a Biprism Experiment, When a Convex Lens Was Placed Between the Biprism and Eyepiece at a Distance of 30 Cm from the Slit, the Virtual Images of the Slits Are Found to Be Separated by 7 Mm. Concept: Measurement of Wavelength by Biprism Experiment.