Embibe Experts Solutions for Chapter: Refraction of Light at Curved Surfaces, Exercise 1: Exercise

The focal length of a convex lens is $40 \mathrm{cm}$. For an object placed $40 \mathrm{cm}$ away from the lens the image will be formed at-

An object is placed at a distance of $5 \mathrm{cm}$ more than the focal length $f$ of a convex lens. Its real image is formed at a distance $3f$ beyond the focus. The focal length $f$ of the lens is:

The radius of curvature of the curved surface at a thin planoconvex lens is $10 \mathrm{cm}$ and the refractive index is $1.5$. If the plane surface is silvered, then the effective focal length will be:

Radii of curvature of a converging lens are in the ratio $1:2$. Its focal length is $6 \mathrm{c}\mathrm{m}$ and refractive index is $1.5$. Then its radii of curvature are:

The refractive index of material of a Plano-convex lens, if the radius of curvature of the plane surface $\left(R_1\right)$ is infinite while the radius of curvature of convex surface $\left(R_2\right)$ is $20 \mathrm{c}\mathrm{m}$ and focal length of the lens is $30 \mathrm{c}\mathrm{m}$, will be:

Differentiate focal length and radius of curvature.

Write the role of lenses in our daily life.

Is the point $2F$ and centre of curvature the same. Explain.