Question

A bus uses a convex mirror as a viewfinder whose radius of curvature is for metre a car is coming behind the best which is at a distance of 20 metre what will be the position and the size of the image of the car when observed by the driver of the bus through the convex mirror

Answer 1

The image is placed at position 5 m and the size of the image is 1/2 m.

Explanation:

Correct statement:

A bus uses a convex mirror as a viewfinder whose radius of curvature is 20 metre a car is coming behind the best which is at a distance of 10 metre what will be the position and the size of the image of the car when observed by the driver of the bus through the convex mirror

Solution:

Radius(R)=20 m

Focal length(f) = 20/2= 10 m

Applying lens mirror formula

1/v+1/u=1/f

1/v - 1/10 = 1/1 0

1/v = 1/10 +1/10 = 2/10 = 1/5

v = 5 m

Position of the image will be 5 m in the mirror

Magnification(M) = v/u = (5/10) / (-10) = -5

Size of image= M x u = -5 x (-1/11) = 1/2 m

Thus the image is placed at position 5 m and the size of the image is 1/2 m.