If 40 cm each is the object and image distance respectively for a convex lens then the focal length is ……………………
A) 80 cm
B) 40 cm
C) 20 cm
D) 25 cm
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For a convex lens when object is placed between focal point and optic centre then the position of the image is …………………
C) same side of the lens
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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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if a convex lens has its ob j ect and image distance equal (say x) the focal length is equal to …………………
Correct option is B) x/2
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If the image distance of a convex lens of focal length 25 cm is 75 cm then the object distance is ……………………
Correct option is A) -37.5 cm
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An image is formed at a distance of 60 cm from the centre of a convex lens when the object distance
Correct option is B) 20 cm
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An image is formed at distance of 30 cm from the centre of convex lens of focal length 15 cm. The distance of the object is ………………..
Correct option is C) 30 cm
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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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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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