Presbyopia can be corrected by using ………………… lens.
A) convex
B) concave
C) bifocal
D) cylindrical
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The Convex lens behaves as a converging lens if it is kept in a medium with refractive index less than the refractive index of the lens.
B) Both statements are false
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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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We can’t discuss the size and nature of the image formed while using a convex lens, when the object is placed ………………………
Correct option is B) at F
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Hypermetropia can be corrected by using ………………….
B) convex lens
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If a person uses a lens of -2.5 D power, then the focal length of the lens is ……………………
Correct option is C) -40 cm
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Find the focal length of the lens if the power of the lens is – 2D
Correct option is B) 50 cm
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A doctor advised to use 4D lens. The focal length of the lens is ……………………..
Correct option is A) 25cm
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A doctor has advised to use 2.5D lens. The focal length of the lens is …………………..
Correct option is A) 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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“Science is a history of corrected mistakes”. This was said by
(D) Karl Popper
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