P is a point on the axis of a concave mi...

P is a point on the axis of a concave mirror. The image of P, formed by the mirror, coincides with P. A rectangular glass slab of thickness t and refractive index `mu` is now introduced between P and the mirror. For the image of P to coincide with P again, the mirror must be moved

towards P by `(mu-1)t`

away from P by `(mu-1)t`

away from the lens by `t(1-1/(mu))`

towards the lens by `t(1-1/(mu))`

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