A girl A is a reading a book having 446 pages and she has already finished reading 271 pages. She wants to finish reading this book within a week. What is the minimum number of pages she should read per day to complete reading the book within a week ?

A man with normal near point (25 cm ) reads a book with small print using a magnifying glass : a thin convex lens of focal length 5 cm . a What is the closest and the farthest distance at which he should keep the lens from the page so that can read the book when viewing through the magnifying glass ? b. What is the maximum and the minimum angular magnification (magnifying power ) possible using the above simple microscope ?

A man with a near point of 25 cm reads a book small print using a maagnifying glass, a convex lens of focal length 5 cm. (a) What is the closest and the farthest distance at which he should keep the lens from the page so that he can read the book when viewing through the magnifying glass? (b) what is the maximum and the minimum magnification (magnifying power) possible using the above simple microscope?

A lady cannot see objects closer than 40cm from the left eye and closer than 100cm from the right eye. While on a mountaining trip, she is lose from her team. She tries to make an astronomical trip, from her reading glasses to look from her teammates. (a) Which glass should she use as the eyepiece? (b) What magnification can she get with relaxed eye?

The near and far points of a person are at 40 cm and 250cm respectively. Find the power of the lens he/she should use while reading at 25cm . With this lens on the eye, what maximum distance is clearly visible?

A person has near point at 100 cm. What power of lens is needed to read at 20 cm if he/she uses (a) contact lens, (b) spectacles having glasses 2.0 cm separated from the eyes?