Optical Instruments

The expression for astronomical telescope magnifying power is

In an astronomical telescope, $f_0=20 \mathrm{cm}$ and $f_e=5 \mathrm{cm}$, then find out the maximum magnification of a distant object. Take least distance of clear vision, $D=25 \mathrm{cm}$.

The image in an astronomical telescope is inverted.

What is an astronomical telescope?

Write the use of astronomical telescope.

An astronomical telescope is used to view heavenly bodies like stars, planets galaxies and satellites.

Explain the image formation of the compound microscope.

Explain the construction of compound microscope.

What are the uses of compound microscope.

Least count travelling microscope is $0.01 \mathrm{mm}$.

Travelling microscope works based on the principle of vernier.

A travelling microscope is one of the best instrument for measuring very small length with high degree of accuracy at the order of _____$\mathrm{mm}$.

A travelling microscope is one of the best instrument for measuring very small length with high degree of accuracy at the order of $0.01 \mathrm{mm}$.

What are the uses of travelling microscope.

Elaborate view of the galaxies, planets, stars and other heavenly bodies is possible with the help of telescopes.

Telescope is not easily portable one and needed frequent maintenances.

Telescope can be viewed even with the low intensity of light.

List two disadvantages of telescope.

Which of these is not an application of a simple microscope?

An astronomical telescope has a converging eyepiece of focal length $5 \mathrm{cm}$ and an objective of focal length $80 \mathrm{cm}$ . When the final image is formed at the least distance of distinct vision$\left(25 \mathrm{cm}\right)$, the separation between the two lenses is