Question

A concave mirror produces three times enlarged image of an object placed at 10cm in front of it. Calculate the focal length of the mirror. Show the image formation with the help of a react is placed 6cm away from the pole of a convex mirror

Answer 1

Answer:

f = -15

Explanation:

m = -v/ u

3= - v/ -10

3= v/10

3×10= v

v = 30cm

focal length:

mirror formula:

1/v + 1/u = 1/ f

1/30 + 1/ (-10) = 1/f

1-3/30= 1/f

- 2/30 =1/f

-1/15 = 1/f

f = -15