Question

A thin lens has a focal length of -25cm . What is the power of the lens and what is its nature ( type of lens ) ?





ans to d above question...NO SPAM❌​

Answer 1

Answer:

Power of lens is P=

f

1

​

 ,focal length should be in meter

f=−25cm=−.25m

so P=

−0.25

1

​

=−4D

Since the focal length is negative, it is a concave lens or diverging lens

Explanation:

Answer 2

Answer:

Since the focal length is negative, it is a concave lens or diverging lens. Calculate the power yourself as shown in the above question. The power will be, -4D.