Question

An object is at a distance of 10 cm from a mirror and the image of the object is at a distance of 40 cm from the mirror on the same side as the object. Then the focal length and the nature of the mirror is:
A. 7.5 cm, convex
B. 15 cm, convex
C. 15 cm, concave
D. 7.5 cm, concave ​

Answer 1

Answer:

(c)

Explanation:

Correct option is

D

concave, 15cm

u=−10 cm

v=−30 cm

f=?

v

1

−

u

1

=

f

1

−30

1

+

10

1

=

f

1

−300

10−30

=

f

1

f=−15 cm

-ive sign denotes it

is convace mirror.

Answer 2

Answer:

concave

Explanation:

please assure the no. because every way i try im getting -8