Question

(a) An object is placed just outside the principal focus of concave mirror. Draw a ray diagram to show how the image is formed, and describe its size, position and nature.
(b) If the object is moved further away from the mirror, what changes are there in the position and size of the image?
(c) An object is 24 cm away from a concave mirror and its image is 16 cm from the mirror. Find the focal length and radius of curvature of the mirror, and the magnification of the image.

Answer 1

Radius of Curvature is - 19.2 cm

Explanation:

• a.) The image is formed beyond the center of curvature of the mirror and the nature of the image is real, inverted and magnified.  

refer figure (a) as attachment

• b.) The image will be formed near the mirror but size decreases, on moving object away from the mirror.

refer figure (b) as an attachment

• c.) u = - 24 cm, v= - 16 cm

R=? m=?

we know that

$\frac {1}{v} + \frac {1}{u} = \frac {1}{f}$

$\frac {1}{-16} + \frac {1}{-24} = \frac {1}{f}$

$\frac {-5}{48} = \frac {1}{f}$

f = - 9.6 cm

We know that R = 2f

R = $2 \times 9.6$

R = - 19.2 cm

Answer 2

Answer:

It is the correct answer for the question