Embibe Experts Solutions for Chapter: Light - Reflection and Refraction, Exercise 1: assam board-2019

A $20 \mathrm{mm}$ tall object is placed perpendicular to the principal axis of a convex lens of focal length $10 \mathrm{cm}$. If the distance of the object from the lens is $15 \mathrm{cm}$, then find the natures position and size of the image.

A $20 \mathrm{mm}$ tall object is placed perpendicular to the principal axis of a convex lens of focal length $10 \mathrm{cm}$. If the distance of the object from the lens is $15 \mathrm{cm}$, then find the magnification of the image.

Find the power of a concave lens of focal length $2 \mathrm{m}$.

A concave lens has focal length of $15 \mathrm{cm}$. At what distance should the object from the lens be placed so that it forms an image at $10 \mathrm{cm}$ from the lens? Also find the magnification and nature of the image produced by the lens. 

Which of the following lenses would you prefer to use while reading very small letters?

Draw the ray diagram when an object is placed at twice the focal length of a Convex Lens.

An object of size $70 \mathrm{mm}$ is place at $27 \mathrm{cm}$ in front of a concave mirror of focal length $18 \mathrm{cm}$.  At what distance from the mirror should a screen be placed so that a sharp focussed image can be obtained? Find the size and nature of the image.

A concave lens has a focal length of $15 \mathrm{cm}$. At what distance should the object from the lens be placed so that it forms an image at $10 \mathrm{cm}$from the lens? Also, find the magnification produced by the lens? What is the nature of the image?