Question

A spherical mirror produces an image 48 cm in front of it , when an objet is positioned 12 cm from its pole .




identify the nature of mirror

is the image magnified or diminished

State whether the image formed is real or virtual

is the image formed erect or inverted

in the above situation , u= ? nd v=___ ?

calculate focal length

calculate magnification

if the object size is 5mm.calculate the size of image formed

write any two applications of the type of speherical mirror used here?

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