The maximum focal length of the myopia eye is …………………
A) 2.5 cm
B) less than 2.5 cm
C) more than 2.5 cm
D) 22.7 cm
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When a lens of focal length f is cut in to two equal halves perpendicular to principal axis, then the focal length of each part of the lens is ………………
Correct option is B) double
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A convex lens of focal length 20 cm is cut into two halves along principal axis then focal length of each part will be …………………
Correct option is A) 20 cm
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A convex lens of focal length 20 cm is cut into two halves perpendicular to the principal axis then focal length of each part will be ……………….
Correct option is C) 40 cm
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The change in focal length of an eye lens is caused by the action of the ………………..
C) ciliary muscles
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When the eye is focused on a closer object the focal length of the eye lens ………………..
Correct option is B) decreases
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The range of focal length of an eye lens is…………………..
C) 2.27 to 2.50 cm
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The value of focal length of the eye lens when an object is at infinity is ………………………
Correct option is A) 2.50 cm
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The maximum and minimum focal lengths of the eye lens respectively are ………………….
C) 2.5 cm, 2.27 cm
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The focal length of the lens to be used to correct myopia when the far point distance is “d” cm.
Correct option is B) f = -d
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In case of eye defect called “myopia” image is formed ………………………
B) before retina
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