Question

An object is placed at a distance of 6cm ,find the convex mirror of a focal length 12cm.Find the position and nature of the image ?
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Answer 1

Answer:

This might help you

Explanation:

u= -6cm

f= 12cm

1/v=1/f-1/u

1/v=1/12+1/6

= 3/12

v= 12/3=4cm

m=-v/u = -4/-6=2/3 =0.67

So the image is virtual, erect and diminished

Answer 2

u = -6 cm

f = 12cm (convex mirror )

v = ?

Formula :- 1/f = 1/v + 1/u

According to the question,

1/12 = 1/v + 1/-6

1/12 = 1/v + 1/-6

1/12 = 1/v - 1/6

1/12 + 1/6 = 1/v

6+12/72 = 1/v

18/72 = 1/v

v = 72/18 ( Reciprocal)

v = 4 cm

Therefore, v = 4 cm.

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