Question

Explain mirror formula and its magnification Write down the sign conversation for reflection by Spherical mirror ?​

Answer 1

Answer:

This formula is valid for all kinds of spherical mirrors, for all positions of the object. Although one needs to be careful about the values, one puts for u,v and f with appropriate sign according to the sign convention given above.

Answer 2

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Sign convention for reflection by spherical mirror is New Cartesian sign Conention.

The object is placed left of the mirror.The light falls on LHS.

All distances parallel to principal axis are measured from pole of the mirror

All origin RHS ( x-axis) are taken as positive while on LHS origin (x-axis) are taken as negative.

Distance measured perpendicular to above principal axis (y-axis) are positive.

Distance below principal axis perpendicular (y-axis) are negative.

The mirror formula for reflection -

1/v +1/u =1/f

Magnification is for nature of image and size of an object.

m = height of image / height of object .

m=h*/h. or -v/u

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