Question

A book is placed in front of a concave mirror of focal length 15 cm. If the object distance is 10 cm, the image is formed​

Answer 1

Answer:

Explanation

Given, u=−10cm,R=15cm,∴f=

2

R

=−

2

15

cm

From mirror formulae,

v

1

+

u

1

=

f

1

⇒

v

1

=

f

1

−

u

1

⇒

v

1

=

10

1

−

15

2

⇒v=−30

Nature of image is real and inverted.

Answer 2

Answer:

she measure the length of a string by keeping its one end at the 3.0 cm mark. If the other end of the string READS 92.8 CM , find the length of the string. if you subtract the given length of the string with the point coinciding with the other end of the string, you will find the answer. =89.8cm