Question

10.3 cm b) 11.0 cm c) 12.2 cm d) 1.7 cm 9. The focal length of the concave mirror in the experimenji​

Answer 1

Answer:

Correct option is

B

200

Using the lens formula for the objective lens,

f

1

=

v

1

−

u

1

1.2

1

=

v

1

−

−1.25

1

This gives v=30cm

Now, magnification is given m=

u

v

×

f

e

D

Substituting the values, m=

1.25

30

×

3

25

Thus, m=200