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A screen is placed at a distance of 5 cm...

A screen is placed at a distance of 5 cm from a point source. A 5 mm thick piece of glass of refractive index 1.5 is placed between them. What is the length of optical path between the source and the screen ?

Text Solution

Verified by Experts

Length of air path between the source and screen =5-0.5 = 4.5 cm
Air path equivalent to path through glass plate
= refractive index `xx` thickness = `1.5 xx 0.5 `=0.75 cm
`:.` Length of optical path `=4.5 + 0.75 = 5.25 cm . `
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