1.

Two plane mirrors subtend an angle theta . Light incident on one mirror after reflection from the other mirror returns parallel to the original direction. The angle thetamust be

Answer»

`30^@ `
`45^@ `
`60^@`
`90^@`

Solution :If ANGLE of incident of first MIRROR and angle of reflection from second mirror are EQUAL, then the TWO mirrors are perpendicular to each other.


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