Neha Jindal Solutions for Chapter: Light Reflection and Refraction, Exercise 3: Unsolved Numerical Problems for Practice

An object is placed at a distance of $10 \mathrm{cm}$ from a convex mirror of focal length $15 \mathrm{cm}$. Find the position and nature of the image.

An object $5 \mathrm{cm}$ in length is placed at a distance of $20 \mathrm{cm}$ in front of a convex mirror of radius of curvature $30 \mathrm{cm}$. Find the position of image, its nature and size.

A convex lens forms a real and inverted image of a needle at a distance of $50 \mathrm{cm}$ from the lens. Where is the needle placed in front of the convex lens, so that this image is of the same size as the object?

An object of size $7 \mathrm{cm}$ is placed at $27 \mathrm{cm}$ in front of concave lens of focal length $18 \mathrm{cm}$. At what distance from the lens should the screen be placed, to obtain a sharp, focussed image? Also find the size and nature of the image.