Physics JAMB

A person can focus objects when they lie beyond 75 cm from his eyes. The focal length of the lens required to reduce his least distance of distinct vision to 25 cm is?

A. 37.50 cm
B. 75.00 cm
C. 18.75
D. 25.00 cm

Correct Answer:

Option A – 37.50 cm

Explanation

The least distance of distinct vision required = 25 cm.
∴ for the person to see an object clearly at 25 cm from the eye, the image must be formed at 75 cm on the same side of lens, at his near point.
∴ U = 25 cm; V = -75 cm (image should be virtual)
thus (1)/f = (1)/v +(1)/u
= (1)/75 + (1)/25
=(-1 + 3)/75 = (2)/75
∴f = (75)/2 = 37.50

Sunday

Share
Published by
Sunday
Tags: physics

Recent Posts

List of Universities Offering Veterinary Medicine in Nigeria

Veterinary medicine is the branch of medicine that deals with the prevention, diagnosis, and treatment…

2 months ago

List of Universities Offering Anthropology in Nigeria

Anthropology is the scientific study of human beings and their cultures. It encompasses a wide…

2 months ago

List of Universities Offering Sociology in Nigeria

Sociology is the scientific study of human society, culture, and behavior. It examines the social…

2 months ago

List of Universities Offering Social Work in Nigeria

Social Work is a profession dedicated to helping individuals, families, and communities to cope with…

2 months ago

List of Universities Offering Religious Studies in Nigeria

Religious studies is an academic discipline that explores the beliefs, practices, and history of various…

2 months ago

List of Universities Offering Public Administration in Nigeria

Public administration is the field of study and practice that focuses on the organization and…

2 months ago