1.

In a glass sphere, there is a small bubble 2xx10^(-2)m from its centre, if the bubble is viewed along a diameter of the sphere, from the side on which it lies, how far from the surface will it appear, the radius of glass sphere is 5xx10^(-2)m and refractive index of glass is 1.5?

Answer»

`2.5xx10^(-2)m`
`3.2xx10^(-2)m`
`6.5xx10^(-2)m`
`0.2xx10^(-2)m`

Solution :(a) For spherical surface
`(mu_(2))/v-(mu_(1))/u=(mu_(2)-mu_(1))/R`
Here `mu_(1)=1.5, mu_(2)=1`
`u=(5xx10^(-2)xx10^(-2))`
`=3xx10^(-2)cm`
and `R=5xx10^(-2)cm`
`:. 1/v-1.5/(3xx10^(-2))=(1-1.5)/(5xx10^(-2))`
`v=2.5xx10^(-2)m`

IMAGE will FORM at a distance of `2.5xx10^(-2)m` to the right of nearer surface.


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