The value of focal length of the eye lens when an object is at infinity is ………………………
A) 2.50 cm
B) 2.25 cm
C) 2.27 cm
D) can’t find
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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 placed at a distance of least distance of distinct vision is
Correct option is C) 2.27 cm
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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
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A point object O is placed on the principle axis of a convex lens of focal length 10 cm at 12 cm from the lens.
U = -12 f = -10 1/v - 1/u = 1/f 1/v + 1/12 = 1/10 1/v = 1/60 \(-\frac{1}{v^2} \)dv or \(\frac{1}{u^2} \)du du = \(\frac{v^2}{u^2} \)du \( \frac{v}{u} \)= same path △u1 = △u2 = 1mm △u1 = △v2 △v2 = vf - vi x2 = △v2 + 1mm x2...
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