Question

when an object is placed 10 cm away from a concave mirror, the image is formed at same distance

a) Find the focal length of the mirror
b) write any two properties of the image formed
c) draw the ray diagram if the object is placed at c​

Answer 1

Answer:

Explanation:

Focal length of concave mirror, f = -20 cm

Distance of object from the mirror, u = -10 cm

use formula, 1/v + 1/u = 1/f  

or, 1/v = 1/f - 1/u  

or, 1/v = 1/-20 - 1/-10  

or, 1/v = -1/20 + 1/10 = 1/20  

or, v = +20cm  

hence, image position is the 20cm right side from the pole of the concave mirror as shown in the diagram. The image is straight and bigger than the object.