Question

List the sign conventions for reflection of light by spherical mirrors. Draw a diagram and apply these conventions in the determination of focal length of a spherical mirror which forms a three times magnified real image of an object placed 16 cm in front of it.

Answer 1

Answer:

All distances are measured from the pole of the mirror. III. Distances along the direction of the incident ray ( along positive X - axis) are taken as positive, while distances along the direction of the reflected ray (along negative X-axis) are taken as negative.

Explanation:

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Answer 2

Answer:

1. The object is always assumed to be placed on the left side of a mirror
2. All distances are measured from the pole of the sphereical mirror
3. distances measured in the left side is always negative and distances measured from the right side is always postive
4. the upward height is postive and downward height is negative

magnification :3

object distance: -16

m=-v/u

3 =-v/-16

v =-48

1/f=1/v+1/u

f= 1/-48+1/-16= 1/-12

f= -12