Question

A spherical mirror produces an image at 48cm in front of it when an object is positioned at 12cm from its pole

Answer 1

As the image is formed in front of the mirror, it is a concave mirror. u = −12 cm v = −48 cm Magnification m = −v/u = −48 /12 = −4 The image is magnified. It is real and inverted.

Answer 2

Identify the nature of mirror : concave  

Is the image magnified or diminished : enlarged  

State whether the image formed is real or virtual: real  

Is the image formed erect or inverted: erect  

In the above situation , u= ? nd v=___ ? what is u, what is v ?  

Calculate focal length: with di = image distance, do = object distance  

1/di + 1/du = 1/f  

1/12 + 1/48 = 1/f  

f = 48/5  

Calculate magnification:  

Magnification = di/do = 48/12 = 4 fold  

If the object size is 5mm.

Calculate the size of image formed: 20 mm