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An infinitely long reactangular strip is...

An infinitely long reactangular strip is placed on principal axis of a concave mirror as shown in figure. One end of the strip coincides with centre of curvature as shown. The hright of rectangular strip is very small in comparison to focal length of the mirror. Then the shape of image of strip formed by concave mirror is
.

A

Rectangle

B

Trapezium

C

Triangle

D

Square

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