State the sign convention for reflection of light by spherical mirror and draw
appropriate diagram
Answers
Explanation:
1. The object is always placed to the left of the mirror. 2. All the distances parallel to the principal axis are always measured from the pole of the spherical mirror. 3. All the distances measured along the direction of incident light (along +ve x-axis), are considered to be positive. 4. Those distances measured opposite to the direction of incidence light (i.e. along -ve x-axis), are taken as negative. 5. The distances measured in upward direction, i.e. perpendicular to and above the principal axis (along +ve y-axis), are taken as positive. 6. The distances measured in the downward direction, (along -ve y-axis), i.e. perpendicular to and below the principal axis are taken as negative. From the question u = -16 cm, m = -3 for real image So, focal length of spherical mirror is 12 cm. Negative sign of focal length indicates that mirror is concave in nature. Read more on Sarthaks.com - https://www.sarthaks.com/499739/conventions-reflection-light-spherical-mirrors-diagram-apply-conventions-determination?show=499744#a499744