Question

the image formed by spherical mirror is real inverted and is of magnification lens to make the image and distance of 30 cm from the mirror where is the object placed find the focal length of the mirror List two characteristics of image formed if the object is moved 10cm centimetre towards the mirror

Answer 1

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Answer 2

Answer:

Explanation:

Given :-

m = - 2

v = - 30 cm

u = ?

Solution :-

⇒ - 2 = - (- 30)/u

⇒ u = - 30/2

⇒ u = - 15 cm

Hence, The object distance is - 15 cm.

By Mirror formula,

1/v + 1/u = 1/f

⇒ 1/f = - 1/30 - 1/10

⇒ 1/f = - 15 - 30/450

⇒ 1/f = - 45/450

⇒ 1/f = - 1/10

⇒ f = - 10 cm

Hence, The focal length is - 10 cm.

If the object is moved 10 cm centimetre towards the mirror, the image will be of the virtual and erect and size will be enlarged.