- AOpen loops.
- BClosed loops.
- CBoth a and b.
- DNone.
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If the distance of the far point for a myopia patient is doubled, the focal length of the lens required to cure it will become
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(a) Half |
(b) Double |
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(c) The same but a convex lens |
(d) The same but a concave lens |
Assertion : Different colours travel with different speed in vacuum.
Reason : Wavelength of light depends on refractive index of medium.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If assertion is false but reason is true. |
Two lenses of power 6D and – 2D are combined to form a single lens. The focal length of this lens will be
|
(a) |
(b) |
(c) 4 m |
(d) |
Three bulbs of 40 W, 60 W, 100 W are arranged in series with 220 volt supply which bulb has minimum resistance
|
(a) 100 W |
(b) 40 W |
(c) 60 W |
(d) Equal in all bulbs |