Answer :

Given data

For objective lens-

Power of the objective lens = 25 D

Using lens formula, the focal length of the objective lens becomes-

Power of eyepiece-

Power of the eyepiece = 5 D

The focal length of the eyepiece is given by

(a) The focal length of objective is less than the eyepiece,

Hence the instrument is a microscope

(b)Given data

length of the Tube , *l* = 25 cm

Distance between image and eye lens, *v _{e}* = 25 cm

The length of the tube ,l is given by-

Using lens formula for objective lens-

For the microscope, the angular magnification m is

Hence the angular magnification required is 20.

Rate this question :

A person haHC Verma - Concepts of Physics Part 1

A near-sighHC Verma - Concepts of Physics Part 1

The near poHC Verma - Concepts of Physics Part 1

A normal eyHC Verma - Concepts of Physics Part 1

A professor <spanHC Verma - Concepts of Physics Part 1

A person weHC Verma - Concepts of Physics Part 1

An astronomical <HC Verma - Concepts of Physics Part 1

The separatHC Verma - Concepts of Physics Part 1

Find the maHC Verma - Concepts of Physics Part 1

A lady cannot <spHC Verma - Concepts of Physics Part 1