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  4. If two mirrors are kept at 60° to each other, then the number of images formed by them is:

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Q. If two mirrors are kept at $60^{\circ}$ to each other, then the number of images formed by them is:

AIEEEAIEEE 2002Ray Optics and Optical Instruments

Solution:

Number of images $n=\frac{360^{\circ}}{\theta}-1$
where 0 is angle between mirrors. Thus,$\theta=60^{\circ}$
(given) So, number of images
$n=\frac{360^{\circ}}{60^{\circ}}-1=5$