Question

An object of 5cm, is kept at a distance of 15cm in front of a concave mirror of
focal length 20cm. Find nature, position and size of image so formed

Answer 1

Explanation:

It will be found to be equal to 6 cm. Thus, object is placed at a distance of 6 cm × 5 = 30 cm from the lens. A concave lens of focal length 15 cm forms an image 10 cm from the lens.

Answer 2

Answer:

height of object=5cm

distance of object=-15cm

focal length=20cm

according to mirror formula

1/v+1/u=1/f

1/v+(1/-15)=1/20

1/v=1/20+1/15

1/v=3+4/60

1/v= 7/60

v=60/7

m= h'/h=-v/u

h'/5=-60/7*15

h'/5=2

h'=5*2

h'=10

Explanation:

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