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(D) The formula for the number of images $n$ formed by two plane mirrors inclined at an angle $	heta$ is given by $n = \frac{360^\circ}{	heta} - 1$

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infinite

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(D) The formula for the number of images $n$ formed by two plane mirrors inclined at an angle $	heta$ is given by $n = \frac{360^\circ}{	heta} - 1$ if $\frac{360^\circ}{	heta}$ is an even integer,and $n = \frac{360^\circ}{	heta}$ if $\frac{360^\circ}{	heta}$ is an odd integer.For two parallel mirrors,the angle between them is $	heta = 0^\circ$.Substituting this into the expression,we get $\frac{360^\circ}{0^\circ} = \infty$.Therefore,an infinite number of images are formed.

When an object is placed between two parallel mirrors,the number of images formed is:

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