Far point of a person is 5 m. In order to have normal vision what kind of spectacles should he use ? 

Monjur Alahi

Far point of a person is 5 m. In order to have normal vision what kind of spectacles should he use ? 

A) Concave lens with focal length 5 m 

B) Concave lens with focal length 10 m 

C) Convex lens with focal length 5 m 

D) Convex lens with focal length 2.5 m


0 like 0 dislike
1 views
Share with your friends

1 Answers

Salim Ahmed Kawsar

Call

A) Concave lens with focal length 5 m

0 like 0 dislike
1 views
Talk Doctor Online in Bissoy App
Compose the funny poem of two lines with or without a rhyme scheme, on ‘The Spectacles’.

Oh spectacles! when will you leave me? Don’t fit on my flat nose, however useful you can be.

2 Answers 63 views
A student uses spectacles of number -2 for seeing distant objects. Commonly used lenses for her/his spectacles are

Correct answer is (A) bi-concave

2 Answers 4 views
Where should an object be placed in order to use a convex lens as a magnifying glass ………………….

C) within the focal length

2 Answers 1 views
The range of vision for a young adult with normal vision …………………….. 

C) 25 cm to infinity

2 Answers 1 views
The far point of human eye with normal vision lies at ……………….. 

Correct option is  D) infinity

2 Answers 1 views
The value of focal length of the eye lens when the object is between infinity and the point of least distance of distinct vision is …………………… 

D) between 2.27 cm to 2.50 cm

2 Answers 1 views
For normal vision the far point is ………………. 

D) at infinity

2 Answers 1 views
The defect in which people can not see objects between near point and point of least distance of distinct vision is called ……………………

B) hypermetropia

2 Answers 1 views
For a hypermetropic eye the image is formed……………., when the object is placed between near point and point of least distance of distinct vision. 

C) beyond the retina

2 Answers 1 views
A concave mirror has a focal length of 25 cm. A person wants to see his face in this mirror. At what distance should the person stand ? 

Correct option is C) 20 cm

2 Answers 1 views
X