Embibe Experts Solutions for Chapter: Ray Optics and Optical Instruments, Exercise 1: Nagaland Board-2019

Draw a neat ray diagram to show the image formation in a compound microscope. Define its magnifying power and derive an expression for it, when the final image is at near point of eye.

A convex lens of focal length $40\mathrm{cm}$ is in contact with a concave lens of focal length $25\mathrm{cm}$. The power of the combination is

Deduce the relation between object and image distance in terms of refractive index of the medium and the radius of curvature of curved spherical surface.

If $\mathrm{f}= 0.5\mathrm{m}$ for a glass lens, what is the power of the lens?

The radii of curvature of the faces of a double convex lens are $10\mathrm{cm}$ and $15\mathrm{cm}$, its focal length is $12\mathrm{cm}$. What is the refractive index of glass?

A convex lens has $20\mathrm{cm}$ focal length in air. What is the focal length in water? [Refractive index of water $=1.33$, Refractive index of air-glass $=1.5$]

A small telescope has an objective lens of focal length $140\mathrm{cm}$ and eyepiece of focal length $50\mathrm{cm}$. What is the magnifying power of telescope when image is at infinity and image is formed at least distance of distinct vision?

Explain the reflective telescope with diagram and write its advantages over refractive telescope. On what factors does its resolving power depend?