# A man with

Given:

(a) Focal length of the magnifying glass, f = 5 cm

Distance vision has the least distance, d = 25 cm

Closest object distance = u

Image distance, v = -d = -25 cm

Applying the lens formula we have: …(1)

Where, f0 = focal length of the objective lens

v0 = Distance of image formation

u0 = Distance of object from objective u = -25/6

u = 4.16 cm

Hence, the closest distance at which the person can read the book is 4.167 cm.

For the object at the longest distance (u’), the image distance (v’) = ∞

Again using equation (1), we get, By solving the above equation we get,

u = – 1/5

Therefore, u’ = -5 cm

Hence, the farthest distance at which the person can read the book is 5 cm.

(b) Maximum angular magnification is given by the relation:

αmax = d/|u′|

= 25/5

= 5

Hence the maximum magnification is 5.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation view all courses RELATED QUESTIONS :

(i) Derive the maPhysics - Board Papers

A symmetric biconPhysics - Board Papers

Mrs. Rashmi SinghPhysics - Board Papers

(a) Describe any Physics - Board Papers

Three immiscible Physics - Exemplar

Obtain an expressPhysics - Exemplar

An equi-convex lePhysics - Exemplar