Question

where should an object be placed in front of a convex mirror of focal length 10cm to get an image 5cm . behind the mirror ?
class X
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Answer 1

Answer:

Since it is a convex mirror, therefore u= -ve and since the image is formed behind the mirror, therefore v= +ve.

The formula for mirror is-

1/v + 1/u = 1/f

1/f = 1/5 + 1/-10

1/f = 1/5 - 1/10

1/f = 2–1/10

1/f = 1/10

f = 10cm

Therefore, the focal length of the convex mirror is 10cm.

Answer 2

Answer:

Hi friends

Explanation:

u=-5 ,f=10

1/v+1/u=1/f

1/v=1/-5=1/10

1/v=1/20+1/5=3/10

v=10/3 or 3.33

The position of the image is 3.33 cm behind the convex mirror.

m=-v/u=-3.33/-5=.66

The image is virtual and erect.