1.

A rays of light is incident on a thick slabof glass of thickness t as shown in figure. The emergent rayis parallel to the incident ray but displaced sideways by a distance d. If theangles are small then d is

Answer»

`t(1+(i)/(r))`
`rt(1-(i)/(r))`
`it(1-(r)/(i))`
`t(1+(r)/(i))`

Solution :LATERAL SHIFT, ` d = (t)/(cosr) SIN (i-r)`
For small ANGLES`sin(i-r) ~~i - r`, `cosr~~1`
`d= t(i-r), d =` it `[1- (r)/(i)]`


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