Lakhmir Singh and Manjit Kaur Solutions for Chapter: Refraction of Light, Exercise 17: Short Answer Type Questions

An erect image $2.0 \mathrm{cm}$ high is formed $12 \mathrm{cm}$ from the lens, the object being $0.5 \mathrm{cm}$ high. Find the focal length of the lens.

A convex lens of focal length $0.10 \mathrm{m}$ is used to form a magnified image of an object of height $5 \mathrm{mm}$ placed at a distance of $0.08 \mathrm{m}$ from the lens. Calculate the position, nature and size of the image.

A convex lens of focal length $6 \mathrm{cm}$ is held $4 \mathrm{cm}$ from a newspaper which has print $0.5 \mathrm{cm}$ high. By calculation, determine the size and nature of the image produced. 

Determine how far an object must be placed in front of a converging lens of focal length $10 \mathrm{cm}$ in order to produce an erect (upright) image of linear magnification $4$.

A lens of focal length $20 \mathrm{cm}$ is used to produce a ten times magnified image of a film slide on a screen. How far must the slide be placed from the lens?

An object placed $4 \mathrm{cm}$ in front of a converging lens produces a real image $12 \mathrm{cm}$ from the lens.

What is the magnification of the image?

An object placed $4 \mathrm{cm}$ in front of a converging lens produces a real image $12 \mathrm{cm}$ from the lens.

What is the focal length of the lens?

An object placed $4 \mathrm{cm}$ in front of a converging lens produces a real image $12 \mathrm{cm}$ from the lens.

Draw a ray diagram to show the formation of image. Mark clearly $F$ and $2F$ in the diagram.