Tue January 17, 2012 By:

Four spherical mirrors of radius of curvature R1, R2, R3, and R4 (R1 > R3 > R2 > R4) are placed against the sunlight. Try to obtain the bright spot on a paper sheet for each mirror. Which mirror forms the brightest spot at a maximum distance from the pole of the mirror? Explain.

Expert Reply
Thu January 19, 2012
bright spot on the paper will form at focal length distance from the mirror.
focal length=radius of curvature/2
so bright spot will be formed at the largest distance for a mirror which has maximum radius of curvature.
so R1 mirror will form bright spot at largest distance.
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