Question

State the mirror formula for determining the focal length of spherical mirrors .write the meanings of the symbols used an object is placed at a distance 25 cm from a concave mirror of focal length 15 cm . calculate the distance of the image from the mirror.

Answer 1

Answer:

Mirror formula for concave mirror is

1/v+1/u=1/f where v is image of the object u is the object and f is the focal length.

Explanation:

u=-25 f=-15 v=?

1/v+1/-25=1/-15

1/v=1/-15-1/-25

1/v=-5+3/75

-2/75cm

Answer 2

Answer:

Image distance (v)= -37.5cm

Explanation:

Mirror formula:

1/f=1/v+1/u

Object distance (u)= -25cm

Focal length (f)= -15cm

1/-15=1/v+1/-25

-1/15=1/v-1/25

-1/15+1/25=1/v

(-25+15)/375=1/v

-10/375=1/v

v= -375/10

v= -37.5cm

Hope this bring a smile in your face