Embibe Experts Solutions for Chapter: Ray Optics, Exercise 10: BEGINNER'S BOX - 10

Magnification of a compound microscope is $30$. The focal length of the eyepiece is $5 \mathrm{cm}$ and the image is formed at least distance of distinct vision. Find the magnification of the objective.

The powers of the lenses of a telescope are $0.5$ and $20 \mathrm{dioptres}$. If the final image is formed at the minimum distance of distinct vision $\left(25 \mathrm{cm}\right)$, then what will be the length of the tube?

The focal lengths of objective and eye piece of a Galilean telescope are respectively 30 cm and 5 cm. Calculate its magnifying power and length when used to view distant object.

A telescope consisting of an objective of focal length $60 \mathrm{cm}$ and an eyepiece of focal length $5 \mathrm{cm}$ focussed on a distant object in such a way that parallel rays emerge from the eyepiece. If the object subtends an angle of $2°$ at the objective, then find the angular width of the image.

The focal lengths of the objective and the eye-piece of an astronomical telescope are $75 \mathrm{cm}$ and $5 \mathrm{cm}$ respectively. Calculate the magnifying power and the length of the telescope when the final image is formed at least distance of distinct vision ($25 \mathrm{cm}$)