Question

An object of height 4 cm is placed at 25 cm distance in front of a concave mirror whose focal length is 15 cm . calculate image distance and height of the image​

Answer 1

Answer:

height = 6cm

Step-by-step explanation:

Given :

Object distance u = 25 cm

Focal length f = 15 cm

We have mirror formula :

1 / f = 1 / v + 1 / u

- 1 / 15 = 1 / v - 1 / 25

1 / v = 1 / 25 - 1 / 15

5 / v = 1 / 5 - 1 / 3

5 / v = ( 3 - 5 ) / 15

5 / v = - 2 / 15

v = - 75 / 2 = - 37.5 cm

We know :

h i / h_o = - v / u

Where i and o represent image and object

height = - ( - 37.5)  × 4 / 25

h= 6 cm

Nature of the image are as :

Real , inverted and magnified

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