Embibe Experts Solutions for Chapter: Light - Reflection and Refraction, Exercise 1: Uttarakhand Board-2018

Write two uses of Concave mirror.

Find the focal length of a lens of Power $2.5 \mathrm{D}$.

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, nature and size of the image.

Light enters from air into a glass plate of refractive index $1.5.$ What will be speed of light in glass? (Speed of light in air = $3\times {10}^{8 }{\mathrm{ms}}^{-1}$)

The distance between pole and principal focus of a spherical mirror is called

The refractive index of water is $1.33$. What is the meaning of this statement?

An object is kept between centre of curvature (C) and focus (F). Show the position of image formed by concave mirror and convex mirror by ray diagram.

An object $4 \mathrm{cm}$ in size, is placed at $25 \mathrm{cm}$ in front of a concave mirror of focal length $15 \mathrm{cm}$. At what distance from the mirror should be screen be place in order to obtain a sharp image? FInd the nature and the size of the image.