Lakhmir Singh and Manjit Kaur Solutions for Chapter: Refraction of Light, Exercise 31: Very Short Answer Type Questions

The power of a lens is, $-2 \mathrm{D}$. What is it's focal length?

What is the nature of a lens having a power of $+0.5 \mathrm{D}$?

What is the nature of a lens whose power is, $-4 \mathrm{D}$?

The optician's prescription for a spectacle lens is marked $+0.5 \mathrm{D}$. What is the:

Nature of spectacles lens?

The optician's prescription for a spectacle lens is marked $+0.5 \mathrm{D}$. What is the:

Focal length of spectacle lens?

A doctor has prescribed a corrective lens of power, $-1.5 \mathrm{D}$. Find the focal length of the lens. Is the prescribed lens diverging or converging?

A lens has a focal length of, $-10 \mathrm{cm}$. What is the power of the lens and what is its nature?

The focal length of a lens is $+150 \mathrm{mm}$. What kind of lens is it and what is its power?