Question

a spherical mirror forms a real image of a point object placed in front of it. the distance of the image and object from the mirror is 30 cm and 20 cm respectively the focal length and nature of the image is. a) 120 cm convex b) 60 cm convex c) 60 mm concave d) 120 mm concave​

Answer 1

Answer:

Correct option is C)

u= Distance of object =20 cm

v= Distance of image =30 cm

Mirror formula =

v

1

−

u

1

=

f

1

=

−30

1

+

20

1

=

f

1

600

20−30

=

f

1

f=−60 cm

- sign means concave

f=60 cm