Question

a focal length of a concave mirror is 12 cm and distance of object from the mirror is 25cm find the the image position​

Answer 1

• focal length of concave mirror = – 12cm
• Object of concave mirror is = –25cm
• image appear in concave mirror = ?

u = –25 cm

f = –12 cm

v = ?

1/v + 1/u = 1/f

1/v + 1/–25 = 1/–12

1/v = 1/–12/ – 1/–25

1/v = 1/–12 + 1/25

1/v = 25 – 12/300

1/v = 13/300

13v = 300

v = 23.07 cm

Position of image is 23.07cm approx