ScienceClass 10CBSE
Q
Size of image of an object by a mirror having a focal length of 20 cm is observed to be reduced to 1/3rd of its size. At what distance the object has been placed from the mirror? What is the nature of the image and the mirror?
A
Soln:
m = 1
3
Using 1 + 1= 1
𝑣 𝑢 𝑓
Calculate u;u = – 80 cm.
Image is real and inverted. Mirror is concave.