Question

a convex mirror used on an automobile has a focal length of 3m. if a car behind is at a distance of 5m, find the location of image of the car in the mirror

Answer 1

Explanation:

It is given that,

Focal length of the convex mirror, f = +3 cm

Distance of the car from the lens, u = -5 cm

Let v is the image distance. It can be calculated as :

$\dfrac{1}{v}=\dfrac{1}{f}-\dfrac{1}{u}$

$\dfrac{1}{v}=\dfrac{1}{3}-\dfrac{1}{(-5)}$

v = 1.875 cm

So, the image is location at a distance of 1.875 cm from the mirror. It is formed in the opposite side of the mirror. Hence, this is the required solution.

Answer 2

Answer:

f=3cm

u=-5cm

1/v=1/f-1/u

1/v=1/3-1/(-5)

v=1.875cm