Question

object distance and image distance of a lens are - 60 cm and - 20cm respectively then the magnitude of the lens will be a) - 0.33 b) +3.0 c) +0.33 d) +4.0 with reason​

Answer 1

Explanation:

From lens formula,

f

1

=

v

1

−

u

1

=

(−20)

1

−

(−60)

1

=−

60

2

⇒f=−30cm

Since the focal length is negative. It is a diverging lens.