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A concave mirror of radius 40 cm lies on...

A concave mirror of radius 40 cm lies on a horizontal table and water is filled in it upto a height of 5cm. A small dust particle floats on the water surface at a point P vertically above the point of contact of the mirror with the table. Locate the image of the dust particle directly above it. `mu_(w)`=2/3.

Text Solution

Verified by Experts

The correct Answer is:
8.75
`(1)/(f)=(1)/(u)+(1)/(v)," '(1)/(20)=(1)/(5)+(1)/(v)`
`v=(-20)/(3)" (virtual)"`
`d_("app")=(d_("real"))/(mu)=(((20)/(3)+5))/(4)," "d_("app")=8.8cm`
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